<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:6d0d89e9-dca2-4aa5-96ba-0e35517550b0,g:d522265f-ac79-4c85-bdd7-a92cf013a390-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.labcorp.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="lh-20231231.xsd#CONSOLIDATEDBALANCESHEETS"/>
  <link:calculationLink xlink:role="http://www.labcorp.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_9c2e25c8-4fcc-43b0-89d6-be1f27c40ebd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_DisposalGroupIncludingDiscontinuedOperationShortTermOperatingLeaseLiabilities_cfbd5394-28c3-451f-b1ec-5a21ee8485b6" xlink:href="lh-20231231.xsd#lh_DisposalGroupIncludingDiscontinuedOperationShortTermOperatingLeaseLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_9c2e25c8-4fcc-43b0-89d6-be1f27c40ebd" xlink:to="loc_lh_DisposalGroupIncludingDiscontinuedOperationShortTermOperatingLeaseLiabilities_cfbd5394-28c3-451f-b1ec-5a21ee8485b6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilitiesCurrent_9231db97-ea53-49f2-a981-826ab6074b6b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_9c2e25c8-4fcc-43b0-89d6-be1f27c40ebd" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilitiesCurrent_9231db97-ea53-49f2-a981-826ab6074b6b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredRevenueCurrent_bbd6bdea-9947-4b29-8d63-92bbea3aef19" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredRevenueCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_9c2e25c8-4fcc-43b0-89d6-be1f27c40ebd" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredRevenueCurrent_bbd6bdea-9947-4b29-8d63-92bbea3aef19" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayableCurrent_77e30d3d-6411-4c8e-b5df-a50ba335f4a7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayableCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_9c2e25c8-4fcc-43b0-89d6-be1f27c40ebd" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayableCurrent_77e30d3d-6411-4c8e-b5df-a50ba335f4a7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_f0af50f7-6f35-47fb-a355-96b66d8607d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_9ae4ad3e-3119-4065-91f0-3027f97d69b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_f0af50f7-6f35-47fb-a355-96b66d8607d7" xlink:to="loc_us-gaap_CommonStockValue_9ae4ad3e-3119-4065-91f0-3027f97d69b2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_4d10c9fb-9987-4cc3-b5ef-ba7eed512e87" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_f0af50f7-6f35-47fb-a355-96b66d8607d7" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_4d10c9fb-9987-4cc3-b5ef-ba7eed512e87" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_d84fcf21-2cbc-4dd0-a3e6-570a5daca7e0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_f0af50f7-6f35-47fb-a355-96b66d8607d7" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_d84fcf21-2cbc-4dd0-a3e6-570a5daca7e0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_b8748b7f-e4a5-4cfd-b48e-c5e21a3c9bc6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_f0af50f7-6f35-47fb-a355-96b66d8607d7" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_b8748b7f-e4a5-4cfd-b48e-c5e21a3c9bc6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_1f1b97db-1a14-4511-a391-26126966ed95" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_f3b41dc9-3a80-4bef-97dd-07acb5b788b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_1f1b97db-1a14-4511-a391-26126966ed95" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_f3b41dc9-3a80-4bef-97dd-07acb5b788b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_91407f92-0154-467f-b417-4c4f1e01fa48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InventoryNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_1f1b97db-1a14-4511-a391-26126966ed95" xlink:to="loc_us-gaap_InventoryNet_91407f92-0154-467f-b417-4c4f1e01fa48" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_f3b16a7a-af90-436b-8e78-6995793525f1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PrepaidExpenseCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_1f1b97db-1a14-4511-a391-26126966ed95" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_f3b16a7a-af90-436b-8e78-6995793525f1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnbilledContractsReceivable_d7dda950-3ed5-4c90-a5fa-22359439ad34" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnbilledContractsReceivable"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_1f1b97db-1a14-4511-a391-26126966ed95" xlink:to="loc_us-gaap_UnbilledContractsReceivable_d7dda950-3ed5-4c90-a5fa-22359439ad34" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_fa9b6dd0-f839-4dfd-94df-2a875648eca0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_1f1b97db-1a14-4511-a391-26126966ed95" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_fa9b6dd0-f839-4dfd-94df-2a875648eca0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_39ea654c-7ce7-4573-807e-6e439313f6dd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_1f1b97db-1a14-4511-a391-26126966ed95" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_39ea654c-7ce7-4573-807e-6e439313f6dd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_91e4454a-0068-455d-9f09-867f4f915e2f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet_7d85871e-7e5c-4606-856b-b66f6cc69153" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_91e4454a-0068-455d-9f09-867f4f915e2f" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet_7d85871e-7e5c-4606-856b-b66f6cc69153" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents_3b6500e3-7934-49f1-ba25-892785c1e7d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_91e4454a-0068-455d-9f09-867f4f915e2f" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents_3b6500e3-7934-49f1-ba25-892785c1e7d9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets_9b2138f7-a47c-484d-a81f-fd01596a12ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_91e4454a-0068-455d-9f09-867f4f915e2f" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets_9b2138f7-a47c-484d-a81f-fd01596a12ac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationPrepaidAndOtherAssetsCurrent_fb93e741-c176-43a0-aa6a-773131437867" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationPrepaidAndOtherAssetsCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_91e4454a-0068-455d-9f09-867f4f915e2f" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationPrepaidAndOtherAssetsCurrent_fb93e741-c176-43a0-aa6a-773131437867" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_384701cd-df04-4ae6-907e-6d8b512b4a0f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_21ecd7ae-ce8c-478a-b220-5b10d61b1d3f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_384701cd-df04-4ae6-907e-6d8b512b4a0f" xlink:to="loc_us-gaap_Liabilities_21ecd7ae-ce8c-478a-b220-5b10d61b1d3f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_NoncontrollingInterestMezzanineEquity_a0dde553-6981-4b5b-b61d-2719ab233c6f" xlink:href="lh-20231231.xsd#lh_NoncontrollingInterestMezzanineEquity"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_384701cd-df04-4ae6-907e-6d8b512b4a0f" xlink:to="loc_lh_NoncontrollingInterestMezzanineEquity_a0dde553-6981-4b5b-b61d-2719ab233c6f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_dabd8f9e-935a-43ea-ab59-7bc77eef2ba2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_384701cd-df04-4ae6-907e-6d8b512b4a0f" xlink:to="loc_us-gaap_StockholdersEquity_dabd8f9e-935a-43ea-ab59-7bc77eef2ba2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_3bcd8173-4b58-41de-8246-88f2ee9f26ea" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_384701cd-df04-4ae6-907e-6d8b512b4a0f" xlink:to="loc_us-gaap_CommitmentsAndContingencies_3bcd8173-4b58-41de-8246-88f2ee9f26ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_c0b61b95-6f47-4200-997d-7a66283224b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_c9d45187-fe7f-49f0-895b-268b4fd7c4d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_c0b61b95-6f47-4200-997d-7a66283224b2" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_c9d45187-fe7f-49f0-895b-268b4fd7c4d9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedIncomeTaxPayableNoncurrent_d2903f4d-a360-4de0-8ddc-bc4f213c516a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedIncomeTaxPayableNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_c0b61b95-6f47-4200-997d-7a66283224b2" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedIncomeTaxPayableNoncurrent_d2903f4d-a360-4de0-8ddc-bc4f213c516a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities_86ae4ba4-8e13-44cd-a618-069a92b2b7fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_c0b61b95-6f47-4200-997d-7a66283224b2" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities_86ae4ba4-8e13-44cd-a618-069a92b2b7fc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilities_3c4f4d2b-d491-48f7-9ae0-4db300f9ca74" xlink:href="lh-20231231.xsd#lh_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_c0b61b95-6f47-4200-997d-7a66283224b2" xlink:to="loc_lh_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilities_3c4f4d2b-d491-48f7-9ae0-4db300f9ca74" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_ac1e6ace-5f5f-4b96-bb02-f3f82ced310c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_b2aea9ec-4658-4ca4-9ae5-2bdc7993c0c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_ac1e6ace-5f5f-4b96-bb02-f3f82ced310c" xlink:to="loc_us-gaap_AccountsPayableCurrent_b2aea9ec-4658-4ca4-9ae5-2bdc7993c0c8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_ShortTermDebtAndLongTermDebtCurrentMaturities_6397ab79-67b1-4e49-a869-c0eecbe30d57" xlink:href="lh-20231231.xsd#lh_ShortTermDebtAndLongTermDebtCurrentMaturities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_ac1e6ace-5f5f-4b96-bb02-f3f82ced310c" xlink:to="loc_lh_ShortTermDebtAndLongTermDebtCurrentMaturities_6397ab79-67b1-4e49-a869-c0eecbe30d57" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredRevenueCurrent_f04eb69e-654b-4476-8aca-4c1557727893" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredRevenueCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_ac1e6ace-5f5f-4b96-bb02-f3f82ced310c" xlink:to="loc_us-gaap_DeferredRevenueCurrent_f04eb69e-654b-4476-8aca-4c1557727893" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_ac4654b7-ebc8-45c0-9113-bd899d2765f2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_ac1e6ace-5f5f-4b96-bb02-f3f82ced310c" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_ac4654b7-ebc8-45c0-9113-bd899d2765f2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_18d1ed4f-8fd9-41b4-8f24-81d38b4c4e93" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_ac1e6ace-5f5f-4b96-bb02-f3f82ced310c" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_18d1ed4f-8fd9-41b4-8f24-81d38b4c4e93" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_45cb6439-7dd2-4389-9973-df97dba6b201" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_ac1e6ace-5f5f-4b96-bb02-f3f82ced310c" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_45cb6439-7dd2-4389-9973-df97dba6b201" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_4d7cc771-3f6e-4637-9df9-84cce1ef09de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_ac1e6ace-5f5f-4b96-bb02-f3f82ced310c" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_4d7cc771-3f6e-4637-9df9-84cce1ef09de" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_4c34ba18-6add-4bdf-89da-c931c098fa9c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_4ba924aa-6c2b-48f8-8b4e-d521216e931b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4c34ba18-6add-4bdf-89da-c931c098fa9c" xlink:to="loc_us-gaap_LiabilitiesCurrent_4ba924aa-6c2b-48f8-8b4e-d521216e931b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_1b0b960d-b52c-46ae-bd7f-a33093e6c7aa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4c34ba18-6add-4bdf-89da-c931c098fa9c" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_1b0b960d-b52c-46ae-bd7f-a33093e6c7aa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_DeferredIncomeTaxesAndOtherTaxLiabilities_27a0db01-dad1-4bda-b05d-e7eee98ac798" xlink:href="lh-20231231.xsd#lh_DeferredIncomeTaxesAndOtherTaxLiabilities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4c34ba18-6add-4bdf-89da-c931c098fa9c" xlink:to="loc_lh_DeferredIncomeTaxesAndOtherTaxLiabilities_27a0db01-dad1-4bda-b05d-e7eee98ac798" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_9f68fa7e-7dfc-4999-8137-d6e4d48177fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4c34ba18-6add-4bdf-89da-c931c098fa9c" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_9f68fa7e-7dfc-4999-8137-d6e4d48177fb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_27067053-e538-4c2d-88ac-4e5173afedfc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4c34ba18-6add-4bdf-89da-c931c098fa9c" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_27067053-e538-4c2d-88ac-4e5173afedfc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_865fed22-3739-44a2-88cf-4bfdcc94d4b6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4c34ba18-6add-4bdf-89da-c931c098fa9c" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_865fed22-3739-44a2-88cf-4bfdcc94d4b6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_85ef99d5-be5f-4df5-9767-44fa0c237034" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4c34ba18-6add-4bdf-89da-c931c098fa9c" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_85ef99d5-be5f-4df5-9767-44fa0c237034" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_db710fa0-6bf8-4141-900b-f3d779aa4124" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_68a2e2e6-c8b9-4a96-a79d-9ba98366b27f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_db710fa0-6bf8-4141-900b-f3d779aa4124" xlink:to="loc_us-gaap_AssetsCurrent_68a2e2e6-c8b9-4a96-a79d-9ba98366b27f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_ec0afe93-136d-4df7-a8f2-0ccbacc5fd4a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_db710fa0-6bf8-4141-900b-f3d779aa4124" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_ec0afe93-136d-4df7-a8f2-0ccbacc5fd4a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_0641e858-eee5-489c-83e1-981c4edc986e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_db710fa0-6bf8-4141-900b-f3d779aa4124" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_0641e858-eee5-489c-83e1-981c4edc986e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_96cebb30-63e4-499c-9f5c-5384b0c1f761" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_db710fa0-6bf8-4141-900b-f3d779aa4124" xlink:to="loc_us-gaap_Goodwill_96cebb30-63e4-499c-9f5c-5384b0c1f761" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_8bfcdad1-d3fe-4fad-be32-5b837c66f987" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_db710fa0-6bf8-4141-900b-f3d779aa4124" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_8bfcdad1-d3fe-4fad-be32-5b837c66f987" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_3f3e6fb2-58a5-460a-a598-b0d7c8d498e7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_db710fa0-6bf8-4141-900b-f3d779aa4124" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_3f3e6fb2-58a5-460a-a598-b0d7c8d498e7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_3d50a766-cbc4-4595-b62a-7728efffbc38" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_db710fa0-6bf8-4141-900b-f3d779aa4124" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_3d50a766-cbc4-4595-b62a-7728efffbc38" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_dbaa4748-4472-4afb-891c-915d9239e7b8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_db710fa0-6bf8-4141-900b-f3d779aa4124" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_dbaa4748-4472-4afb-891c-915d9239e7b8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_4a0dc958-f8ff-4adc-9ee5-17fd33fe47c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsNoncurrent_8845ad38-6068-4d0c-b338-b0583017ebf1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_4a0dc958-f8ff-4adc-9ee5-17fd33fe47c8" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsNoncurrent_8845ad38-6068-4d0c-b338-b0583017ebf1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_4596ffd6-216d-4b27-bc2f-a82670259ba0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_4a0dc958-f8ff-4adc-9ee5-17fd33fe47c8" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_4596ffd6-216d-4b27-bc2f-a82670259ba0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets_092b8164-1974-4fb8-af39-38b5a6254cbf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_4a0dc958-f8ff-4adc-9ee5-17fd33fe47c8" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets_092b8164-1974-4fb8-af39-38b5a6254cbf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssets_dc198370-eba5-4582-a5a9-5fd5bc853957" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssets"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_4a0dc958-f8ff-4adc-9ee5-17fd33fe47c8" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssets_dc198370-eba5-4582-a5a9-5fd5bc853957" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent_c07ec811-d3b8-4041-9edf-3a51e56eaf7c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_4a0dc958-f8ff-4adc-9ee5-17fd33fe47c8" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent_c07ec811-d3b8-4041-9edf-3a51e56eaf7c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwillNoncurrent_e4f8f789-5ada-4ee0-8b73-f5fc3c44c475" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwillNoncurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_4a0dc958-f8ff-4adc-9ee5-17fd33fe47c8" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwillNoncurrent_e4f8f789-5ada-4ee0-8b73-f5fc3c44c475" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.labcorp.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="simple" xlink:href="lh-20231231.xsd#CONSOLIDATEDSTATEMENTSOFOPERATIONS"/>
  <link:calculationLink xlink:role="http://www.labcorp.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_7f3993e0-882f-414e-b79a-ae42fe3bfa14" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_38adb710-2117-430b-948d-91aa6e94b3a4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_7f3993e0-882f-414e-b79a-ae42fe3bfa14" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_38adb710-2117-430b-948d-91aa6e94b3a4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_78246e1e-54e0-484f-b00b-b85aba0fdf5e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_7f3993e0-882f-414e-b79a-ae42fe3bfa14" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_78246e1e-54e0-484f-b00b-b85aba0fdf5e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_55122282-3df7-454e-b492-51c3d35be606" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GrossProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_b6ae5bc2-a7a7-464c-9a19-01dc1de76fa3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_55122282-3df7-454e-b492-51c3d35be606" xlink:to="loc_us-gaap_Revenues_b6ae5bc2-a7a7-464c-9a19-01dc1de76fa3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_97db0483-24a3-4bc6-ae82-7591110dd9ca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfRevenue"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_55122282-3df7-454e-b492-51c3d35be606" xlink:to="loc_us-gaap_CostOfRevenue_97db0483-24a3-4bc6-ae82-7591110dd9ca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_2ce5a4f7-36b4-4878-bca3-35aca123e747" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_069c32df-23dc-4a49-b7a7-3669eea52de7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_2ce5a4f7-36b4-4878-bca3-35aca123e747" xlink:to="loc_us-gaap_ProfitLoss_069c32df-23dc-4a49-b7a7-3669eea52de7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_462b695d-c180-49d8-88ea-f6fc457bf0e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_2ce5a4f7-36b4-4878-bca3-35aca123e747" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_462b695d-c180-49d8-88ea-f6fc457bf0e2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_IncomeLossfromContinuingOperationsBeforeIncomeTaxesandNoncontrollingInterest_c16582e3-0b25-4fa5-a0b2-d82109d648bc" xlink:href="lh-20231231.xsd#lh_IncomeLossfromContinuingOperationsBeforeIncomeTaxesandNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_d49422e6-be73-41c2-b06e-d3713d754b02" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpense"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_lh_IncomeLossfromContinuingOperationsBeforeIncomeTaxesandNoncontrollingInterest_c16582e3-0b25-4fa5-a0b2-d82109d648bc" xlink:to="loc_us-gaap_InterestExpense_d49422e6-be73-41c2-b06e-d3713d754b02" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_bdee47fd-56cb-4556-b22b-982ed5804fab" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_lh_IncomeLossfromContinuingOperationsBeforeIncomeTaxesandNoncontrollingInterest_c16582e3-0b25-4fa5-a0b2-d82109d648bc" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_bdee47fd-56cb-4556-b22b-982ed5804fab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_dce97b9e-8bce-4955-a6cd-2ccc6f3b7d55" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_lh_IncomeLossfromContinuingOperationsBeforeIncomeTaxesandNoncontrollingInterest_c16582e3-0b25-4fa5-a0b2-d82109d648bc" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_dce97b9e-8bce-4955-a6cd-2ccc6f3b7d55" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeNet_1af3c4a2-14aa-4be9-a815-8400f88b0c5c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentIncomeNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_lh_IncomeLossfromContinuingOperationsBeforeIncomeTaxesandNoncontrollingInterest_c16582e3-0b25-4fa5-a0b2-d82109d648bc" xlink:to="loc_us-gaap_InvestmentIncomeNet_1af3c4a2-14aa-4be9-a815-8400f88b0c5c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_c806bee7-880c-422b-9e46-8b6a1ce63f11" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_lh_IncomeLossfromContinuingOperationsBeforeIncomeTaxesandNoncontrollingInterest_c16582e3-0b25-4fa5-a0b2-d82109d648bc" xlink:to="loc_us-gaap_OperatingIncomeLoss_c806bee7-880c-422b-9e46-8b6a1ce63f11" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_99fdd503-11e8-43c3-a6d3-7b3cbce73f34" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_IncomeLossfromContinuingOperationsBeforeIncomeTaxesandNoncontrollingInterest_fdb955c1-c4a9-4b96-96cf-971c969faf2f" xlink:href="lh-20231231.xsd#lh_IncomeLossfromContinuingOperationsBeforeIncomeTaxesandNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_99fdd503-11e8-43c3-a6d3-7b3cbce73f34" xlink:to="loc_lh_IncomeLossfromContinuingOperationsBeforeIncomeTaxesandNoncontrollingInterest_fdb955c1-c4a9-4b96-96cf-971c969faf2f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_0546517f-b7ec-48f7-9a38-b82e9934e6c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_99fdd503-11e8-43c3-a6d3-7b3cbce73f34" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_0546517f-b7ec-48f7-9a38-b82e9934e6c2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_ba0a182c-cc0d-4687-832e-61477b28e472" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_NetRestructuringAndOtherSpecialCharges_2e85010f-3729-46d2-bc55-43d80f3918c3" xlink:href="lh-20231231.xsd#lh_NetRestructuringAndOtherSpecialCharges"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_ba0a182c-cc0d-4687-832e-61477b28e472" xlink:to="loc_lh_NetRestructuringAndOtherSpecialCharges_2e85010f-3729-46d2-bc55-43d80f3918c3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_13a4be7a-2462-44f8-97a5-d90e69d68a25" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_ba0a182c-cc0d-4687-832e-61477b28e472" xlink:to="loc_us-gaap_GrossProfit_13a4be7a-2462-44f8-97a5-d90e69d68a25" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_0c3b31ef-151f-4847-bd48-9a0d460a9bfe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_ba0a182c-cc0d-4687-832e-61477b28e472" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_0c3b31ef-151f-4847-bd48-9a0d460a9bfe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_f0393d30-e38f-4406-9131-18b12aa4d196" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_ba0a182c-cc0d-4687-832e-61477b28e472" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_f0393d30-e38f-4406-9131-18b12aa4d196" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetImpairment_7d115314-e64e-435a-9b4f-e4cb127a901e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillAndIntangibleAssetImpairment"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_ba0a182c-cc0d-4687-832e-61477b28e472" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetImpairment_7d115314-e64e-435a-9b4f-e4cb127a901e" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.labcorp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEEARNINGS" xlink:type="simple" xlink:href="lh-20231231.xsd#CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEEARNINGS"/>
  <link:calculationLink xlink:role="http://www.labcorp.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEEARNINGS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_eec776d3-88ea-4130-9296-70ab4eb49ef0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_63856e92-f530-4018-a8e2-1b91f8d9be28" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_eec776d3-88ea-4130-9296-70ab4eb49ef0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_63856e92-f530-4018-a8e2-1b91f8d9be28" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_ab97637f-5ee8-461d-b783-6c6a2c6b20de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_eec776d3-88ea-4130-9296-70ab4eb49ef0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_ab97637f-5ee8-461d-b783-6c6a2c6b20de" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_7cecff2e-4985-46b0-849b-4b55b4f3533c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax_cac41a23-58d6-431e-ace5-4704cac7d105" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_7cecff2e-4985-46b0-849b-4b55b4f3533c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax_cac41a23-58d6-431e-ace5-4704cac7d105" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax_691500fe-c11a-48fe-9b9b-a0ed76f4542f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_7cecff2e-4985-46b0-849b-4b55b4f3533c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax_691500fe-c11a-48fe-9b9b-a0ed76f4542f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_139c6d69-a544-4772-bf80-cfaec761c68e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_f7506aa3-e6f3-4c28-af49-c39522633222" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_139c6d69-a544-4772-bf80-cfaec761c68e" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_f7506aa3-e6f3-4c28-af49-c39522633222" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_8410db5f-d75a-4359-b33b-edf6cc021e74" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_139c6d69-a544-4772-bf80-cfaec761c68e" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_8410db5f-d75a-4359-b33b-edf6cc021e74" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.labcorp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="lh-20231231.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:calculationLink xlink:role="http://www.labcorp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_46e368c5-0705-4706-a45f-c02ce0f56e65" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_5b5afee4-f76a-4f0b-abe4-be470d4af5fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_46e368c5-0705-4706-a45f-c02ce0f56e65" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_5b5afee4-f76a-4f0b-abe4-be470d4af5fb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_c347299c-04c6-43f3-bdc6-404822d86b89" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_46e368c5-0705-4706-a45f-c02ce0f56e65" xlink:to="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_c347299c-04c6-43f3-bdc6-404822d86b89" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_a3a7b312-3fde-4e93-94ae-419e5d56833c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_f6244529-e073-4c43-9db3-80375160d904" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_a3a7b312-3fde-4e93-94ae-419e5d56833c" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_f6244529-e073-4c43-9db3-80375160d904" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_588a55d4-1909-4f90-b800-d0c8b5c9c328" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_a3a7b312-3fde-4e93-94ae-419e5d56833c" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_588a55d4-1909-4f90-b800-d0c8b5c9c328" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_aaaa04b3-b176-4c58-b1c2-4e0c04bfb830" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_a3a7b312-3fde-4e93-94ae-419e5d56833c" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_aaaa04b3-b176-4c58-b1c2-4e0c04bfb830" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_2925e2c5-0796-4d05-81df-e004647f2665" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_a3a7b312-3fde-4e93-94ae-419e5d56833c" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_2925e2c5-0796-4d05-81df-e004647f2665" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_DepreciationAndAmortizationOfLeasedAssets_5cb328cf-8e9f-47d4-898a-7834b98b816a" xlink:href="lh-20231231.xsd#lh_DepreciationAndAmortizationOfLeasedAssets"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_a3a7b312-3fde-4e93-94ae-419e5d56833c" xlink:to="loc_lh_DepreciationAndAmortizationOfLeasedAssets_5cb328cf-8e9f-47d4-898a-7834b98b816a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_cad3ce07-410c-4940-9b6f-b12daf4d2834" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_a3a7b312-3fde-4e93-94ae-419e5d56833c" xlink:to="loc_us-gaap_ShareBasedCompensation_cad3ce07-410c-4940-9b6f-b12daf4d2834" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_24a80d32-543e-4d98-a369-974894c62481" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherOperatingActivitiesCashFlowStatement"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_a3a7b312-3fde-4e93-94ae-419e5d56833c" xlink:to="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_24a80d32-543e-4d98-a369-974894c62481" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_897f5b70-00e0-44e6-a2e2-d40f846df6c7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_a3a7b312-3fde-4e93-94ae-419e5d56833c" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_897f5b70-00e0-44e6-a2e2-d40f846df6c7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerAsset_3610f088-f669-47c7-935a-097e4f6a84b0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerAsset"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_a3a7b312-3fde-4e93-94ae-419e5d56833c" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerAsset_3610f088-f669-47c7-935a-097e4f6a84b0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_90598a3d-57a6-4bb6-b962-ad10c044a2a4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_a3a7b312-3fde-4e93-94ae-419e5d56833c" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_90598a3d-57a6-4bb6-b962-ad10c044a2a4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_e556447c-0b5a-4f48-95e7-ec9b95098f99" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_a3a7b312-3fde-4e93-94ae-419e5d56833c" xlink:to="loc_us-gaap_ProfitLoss_e556447c-0b5a-4f48-95e7-ec9b95098f99" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_3d05864d-c0d2-4cce-8562-b9c6f125113c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInDeferredIncomeTaxes"/>
    <link:calculationArc order="12" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_a3a7b312-3fde-4e93-94ae-419e5d56833c" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_3d05864d-c0d2-4cce-8562-b9c6f125113c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_5459dd6a-bdaf-4d0a-839e-b4a32d33686e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_a3a7b312-3fde-4e93-94ae-419e5d56833c" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_5459dd6a-bdaf-4d0a-839e-b4a32d33686e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetImpairment_0ed0d4fa-28b0-4317-aa8f-7da0cd74e5e5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillAndIntangibleAssetImpairment"/>
    <link:calculationArc order="14" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_a3a7b312-3fde-4e93-94ae-419e5d56833c" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetImpairment_0ed0d4fa-28b0-4317-aa8f-7da0cd74e5e5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_3bec7f27-3a15-4932-902e-24bf60de9fd5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_52f5477e-3e89-4004-87af-a72af8ebf144" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_3bec7f27-3a15-4932-902e-24bf60de9fd5" xlink:to="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_52f5477e-3e89-4004-87af-a72af8ebf144" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_48c3fdf8-c4d7-4f2b-9f98-c6d60ba247bb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_3bec7f27-3a15-4932-902e-24bf60de9fd5" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_48c3fdf8-c4d7-4f2b-9f98-c6d60ba247bb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_f299ab7e-3fd6-4cf2-aeea-2b9ea2f42642" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_8a2eb23e-db68-45ad-9cc0-a15647333b81" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_f299ab7e-3fd6-4cf2-aeea-2b9ea2f42642" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_8a2eb23e-db68-45ad-9cc0-a15647333b81" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_43486700-a062-4352-b337-074ffd8d1806" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_f299ab7e-3fd6-4cf2-aeea-2b9ea2f42642" xlink:to="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_43486700-a062-4352-b337-074ffd8d1806" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_c0d8108d-25c8-4202-89d0-6b6d3580c80d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_ExcessTaxBenefitShareBasedCompensationFinancingActivities_2c1e05d1-0bf4-4847-b360-0e722aa77bc3" xlink:href="lh-20231231.xsd#lh_ExcessTaxBenefitShareBasedCompensationFinancingActivities"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_c0d8108d-25c8-4202-89d0-6b6d3580c80d" xlink:to="loc_lh_ExcessTaxBenefitShareBasedCompensationFinancingActivities_2c1e05d1-0bf4-4847-b360-0e722aa77bc3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfOrdinaryDividends_80999a45-840a-43dc-ae4c-7e52e8a552c9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsOfOrdinaryDividends"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_c0d8108d-25c8-4202-89d0-6b6d3580c80d" xlink:to="loc_us-gaap_PaymentsOfOrdinaryDividends_80999a45-840a-43dc-ae4c-7e52e8a552c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_c0f4151a-79aa-4f8c-927a-ff2c60d4ad12" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_c0d8108d-25c8-4202-89d0-6b6d3580c80d" xlink:to="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_c0f4151a-79aa-4f8c-927a-ff2c60d4ad12" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_55fe75b3-bd2a-4bd7-a3fe-a96dba60a7d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_c0d8108d-25c8-4202-89d0-6b6d3580c80d" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_55fe75b3-bd2a-4bd7-a3fe-a96dba60a7d9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_bd702405-5d6c-4cd1-aaa8-2dc7a4e62080" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfLinesOfCredit"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_c0d8108d-25c8-4202-89d0-6b6d3580c80d" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_bd702405-5d6c-4cd1-aaa8-2dc7a4e62080" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSeniorDebt_c7026618-07b9-4781-b557-9040aa7a1df9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfSeniorDebt"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_c0d8108d-25c8-4202-89d0-6b6d3580c80d" xlink:to="loc_us-gaap_RepaymentsOfSeniorDebt_c7026618-07b9-4781-b557-9040aa7a1df9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_0c97f8ad-945a-4e69-9b0a-6cf2c1c71810" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_c0d8108d-25c8-4202-89d0-6b6d3580c80d" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_0c97f8ad-945a-4e69-9b0a-6cf2c1c71810" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_89b6dd37-9ba7-4e62-aaa5-0105a717e358" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_c0d8108d-25c8-4202-89d0-6b6d3580c80d" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_89b6dd37-9ba7-4e62-aaa5-0105a717e358" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_NetProceedsFromIssuanceOfStockToEmployees_f32054b2-bb7c-4a51-a5ae-3416ffe752b1" xlink:href="lh-20231231.xsd#lh_NetProceedsFromIssuanceOfStockToEmployees"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_c0d8108d-25c8-4202-89d0-6b6d3580c80d" xlink:to="loc_lh_NetProceedsFromIssuanceOfStockToEmployees_f32054b2-bb7c-4a51-a5ae-3416ffe752b1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfOtherLongTermDebt_6c86240d-1703-49a7-863d-10b267ffb69c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfOtherLongTermDebt"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_c0d8108d-25c8-4202-89d0-6b6d3580c80d" xlink:to="loc_us-gaap_RepaymentsOfOtherLongTermDebt_6c86240d-1703-49a7-863d-10b267ffb69c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_28288159-3229-4609-a802-92c499d7ed75" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_99b86ab5-77b3-45ec-be21-bb4e5e89d027" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_28288159-3229-4609-a802-92c499d7ed75" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_99b86ab5-77b3-45ec-be21-bb4e5e89d027" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_c0675def-6d2c-47cf-9ec4-5ce75af30426" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_28288159-3229-4609-a802-92c499d7ed75" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_c0675def-6d2c-47cf-9ec4-5ce75af30426" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_60481115-27d8-40f1-8bbd-1958649427cc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_28288159-3229-4609-a802-92c499d7ed75" xlink:to="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_60481115-27d8-40f1-8bbd-1958649427cc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_31a3f6e7-271d-4216-8bee-760202965c02" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_28288159-3229-4609-a802-92c499d7ed75" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_31a3f6e7-271d-4216-8bee-760202965c02" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_6bb41b96-ac2a-48b6-b28d-b499fee9ecf4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_28288159-3229-4609-a802-92c499d7ed75" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_6bb41b96-ac2a-48b6-b28d-b499fee9ecf4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfOtherInvestments_da9abcb1-537f-4cdb-8623-6e5ef35df1a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromSaleOfOtherInvestments"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_28288159-3229-4609-a802-92c499d7ed75" xlink:to="loc_us-gaap_ProceedsFromSaleOfOtherInvestments_da9abcb1-537f-4cdb-8623-6e5ef35df1a2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDerivativeInstrumentInvestingActivities_6fe041b5-f9e7-427c-ac70-123fedd9f885" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromDerivativeInstrumentInvestingActivities"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_28288159-3229-4609-a802-92c499d7ed75" xlink:to="loc_us-gaap_ProceedsFromDerivativeInstrumentInvestingActivities_6fe041b5-f9e7-427c-ac70-123fedd9f885" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8559b211-9a89-4245-b93f-6c40524c4e0e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_2b8c06a9-2d77-4a4c-914f-0cafbdf1cac0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8559b211-9a89-4245-b93f-6c40524c4e0e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_2b8c06a9-2d77-4a4c-914f-0cafbdf1cac0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_70c830a3-a0fb-4407-a0f2-3043be6e72b1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8559b211-9a89-4245-b93f-6c40524c4e0e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_70c830a3-a0fb-4407-a0f2-3043be6e72b1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_2928f1f0-0886-4192-a9f1-34aee51a288f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8559b211-9a89-4245-b93f-6c40524c4e0e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_2928f1f0-0886-4192-a9f1-34aee51a288f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_61400814-15be-4856-8b06-df5ea6606cfe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8559b211-9a89-4245-b93f-6c40524c4e0e" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_61400814-15be-4856-8b06-df5ea6606cfe" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.labcorp.com/role/LEASESMaturityofLeasesDetails" xlink:type="simple" xlink:href="lh-20231231.xsd#LEASESMaturityofLeasesDetails"/>
  <link:calculationLink xlink:role="http://www.labcorp.com/role/LEASESMaturityofLeasesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_9a81e466-68c0-40ae-986d-1e1c98b21e36" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree_056bed89-88d0-4772-a2e2-e28b65e0f352" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_9a81e466-68c0-40ae-986d-1e1c98b21e36" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree_056bed89-88d0-4772-a2e2-e28b65e0f352" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo_db9a2e36-c80d-4d66-8735-982b10bf2a7b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_9a81e466-68c0-40ae-986d-1e1c98b21e36" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo_db9a2e36-c80d-4d66-8735-982b10bf2a7b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_c8d65ff8-18c0-499c-a128-adacb50481d6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_9a81e466-68c0-40ae-986d-1e1c98b21e36" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_c8d65ff8-18c0-499c-a128-adacb50481d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive_f22959be-5189-4fc6-b321-f5bc1fa5ef1a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_9a81e466-68c0-40ae-986d-1e1c98b21e36" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive_f22959be-5189-4fc6-b321-f5bc1fa5ef1a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_370bc917-3d9a-4169-ba54-38a6f183c34e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_9a81e466-68c0-40ae-986d-1e1c98b21e36" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_370bc917-3d9a-4169-ba54-38a6f183c34e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour_2008b2ae-10e8-408d-b66a-96f066e473aa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_9a81e466-68c0-40ae-986d-1e1c98b21e36" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour_2008b2ae-10e8-408d-b66a-96f066e473aa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_b4d5835f-29f3-4304-aa5d-ff7774d90004" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_245ec4df-6aa2-4be1-b2c5-422a43bc96dd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_b4d5835f-29f3-4304-aa5d-ff7774d90004" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_245ec4df-6aa2-4be1-b2c5-422a43bc96dd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_ed669ce3-7f55-45be-a682-6c96f6872372" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_b4d5835f-29f3-4304-aa5d-ff7774d90004" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_ed669ce3-7f55-45be-a682-6c96f6872372" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_c747c851-d0d3-4659-ae08-4b9dfc19fc0e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_b4d5835f-29f3-4304-aa5d-ff7774d90004" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_c747c851-d0d3-4659-ae08-4b9dfc19fc0e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_0736d86b-2668-43f7-b13d-e0ca442ebcd8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_b4d5835f-29f3-4304-aa5d-ff7774d90004" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_0736d86b-2668-43f7-b13d-e0ca442ebcd8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_da98ccd1-1822-4195-bc11-ec6b4758dfb4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_b4d5835f-29f3-4304-aa5d-ff7774d90004" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_da98ccd1-1822-4195-bc11-ec6b4758dfb4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_87f75d63-ad9d-4917-8e0b-5909893f9227" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_b4d5835f-29f3-4304-aa5d-ff7774d90004" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_87f75d63-ad9d-4917-8e0b-5909893f9227" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.labcorp.com/role/PROPERTYPLANTANDEQUIPMENTNETDetails" xlink:type="simple" xlink:href="lh-20231231.xsd#PROPERTYPLANTANDEQUIPMENTNETDetails"/>
  <link:calculationLink xlink:role="http://www.labcorp.com/role/PROPERTYPLANTANDEQUIPMENTNETDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_84ec2509-ede2-450e-8bb5-d7e16a413047" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_12775045-eac4-4329-967e-5fc573b709ec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_84ec2509-ede2-450e-8bb5-d7e16a413047" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_12775045-eac4-4329-967e-5fc573b709ec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_3b61e059-f730-4097-ac85-6c1e9dc950c4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_84ec2509-ede2-450e-8bb5-d7e16a413047" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_3b61e059-f730-4097-ac85-6c1e9dc950c4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.labcorp.com/role/GOODWILLANDINTANGIBLEASSETSCOMPONENTSOFIDENTIFIABLEINTANGIBLEASSETSDetails" xlink:type="simple" xlink:href="lh-20231231.xsd#GOODWILLANDINTANGIBLEASSETSCOMPONENTSOFIDENTIFIABLEINTANGIBLEASSETSDetails"/>
  <link:calculationLink xlink:role="http://www.labcorp.com/role/GOODWILLANDINTANGIBLEASSETSCOMPONENTSOFIDENTIFIABLEINTANGIBLEASSETSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_f133df6b-7f4a-44bc-ae5a-710f9bcfb462" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_9f3e1fc7-5d29-4089-91c6-82330033fe42" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_f133df6b-7f4a-44bc-ae5a-710f9bcfb462" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_9f3e1fc7-5d29-4089-91c6-82330033fe42" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_9cdd8343-99f2-455a-b25c-0645a64a172b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_f133df6b-7f4a-44bc-ae5a-710f9bcfb462" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_9cdd8343-99f2-455a-b25c-0645a64a172b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.labcorp.com/role/ACCRUEDEXPENSESANDOTHERDetails" xlink:type="simple" xlink:href="lh-20231231.xsd#ACCRUEDEXPENSESANDOTHERDetails"/>
  <link:calculationLink xlink:role="http://www.labcorp.com/role/ACCRUEDEXPENSESANDOTHERDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_15b9271c-0c24-4b28-9ff2-212b1dbafbbe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_7765a1fc-2056-4171-8b8c-a17cbbb06dbf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_15b9271c-0c24-4b28-9ff2-212b1dbafbbe" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_7765a1fc-2056-4171-8b8c-a17cbbb06dbf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxesPayableCurrent_4bb9be3c-4ae2-41c9-b172-4b6f60edfa60" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxesPayableCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_15b9271c-0c24-4b28-9ff2-212b1dbafbbe" xlink:to="loc_us-gaap_TaxesPayableCurrent_4bb9be3c-4ae2-41c9-b172-4b6f60edfa60" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_7f2c4292-2af6-4c8a-a84a-a54294a7d6b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_15b9271c-0c24-4b28-9ff2-212b1dbafbbe" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_7f2c4292-2af6-4c8a-a84a-a54294a7d6b5" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.labcorp.com/role/DEBTSCHEDULEOFSHORTTERMDEBTDetails" xlink:type="simple" xlink:href="lh-20231231.xsd#DEBTSCHEDULEOFSHORTTERMDEBTDetails"/>
  <link:calculationLink xlink:role="http://www.labcorp.com/role/DEBTSCHEDULEOFSHORTTERMDEBTDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrent_ca84d9a4-c294-48d5-a462-9e4223f8d64e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_A3.25SeniorNotesDue2024ShortTerm_041cff7b-487c-4469-99d9-85cd7a2da248" xlink:href="lh-20231231.xsd#lh_A3.25SeniorNotesDue2024ShortTerm"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtCurrent_ca84d9a4-c294-48d5-a462-9e4223f8d64e" xlink:to="loc_lh_A3.25SeniorNotesDue2024ShortTerm_041cff7b-487c-4469-99d9-85cd7a2da248" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_A4.00Seniornotesdue2023_737ed65f-cf04-4e80-9ae8-696bd4c1700d" xlink:href="lh-20231231.xsd#lh_A4.00Seniornotesdue2023"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtCurrent_ca84d9a4-c294-48d5-a462-9e4223f8d64e" xlink:to="loc_lh_A4.00Seniornotesdue2023_737ed65f-cf04-4e80-9ae8-696bd4c1700d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableCurrent_360b4ec5-03a1-4278-b7c0-cd0061a7d1e7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NotesPayableCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtCurrent_ca84d9a4-c294-48d5-a462-9e4223f8d64e" xlink:to="loc_us-gaap_NotesPayableCurrent_360b4ec5-03a1-4278-b7c0-cd0061a7d1e7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_A2.30SeniorNotesDue2024ShortTerm_bb20c9e6-b767-43b5-9833-9ea0280869c3" xlink:href="lh-20231231.xsd#lh_A2.30SeniorNotesDue2024ShortTerm"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtCurrent_ca84d9a4-c294-48d5-a462-9e4223f8d64e" xlink:to="loc_lh_A2.30SeniorNotesDue2024ShortTerm_bb20c9e6-b767-43b5-9833-9ea0280869c3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_Shorttermdebtissuancecosts_3a178d72-b22c-4f42-901c-1c768def5f0d" xlink:href="lh-20231231.xsd#lh_Shorttermdebtissuancecosts"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtCurrent_ca84d9a4-c294-48d5-a462-9e4223f8d64e" xlink:to="loc_lh_Shorttermdebtissuancecosts_3a178d72-b22c-4f42-901c-1c768def5f0d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.labcorp.com/role/INCOMETAXESDetails" xlink:type="simple" xlink:href="lh-20231231.xsd#INCOMETAXESDetails"/>
  <link:calculationLink xlink:role="http://www.labcorp.com/role/INCOMETAXESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_20beb1eb-b360-4cf3-8f07-d20ba7fef4b9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit_8976f249-107b-48b8-b21a-9a5f851105c6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CurrentFederalTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_20beb1eb-b360-4cf3-8f07-d20ba7fef4b9" xlink:to="loc_us-gaap_CurrentFederalTaxExpenseBenefit_8976f249-107b-48b8-b21a-9a5f851105c6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_c2f0c5e7-625a-4bef-8c36-443fc5c54340" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_20beb1eb-b360-4cf3-8f07-d20ba7fef4b9" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_c2f0c5e7-625a-4bef-8c36-443fc5c54340" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentForeignTaxExpenseBenefit_f79fb4bd-8829-48a2-8456-379e29be357d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CurrentForeignTaxExpenseBenefit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_20beb1eb-b360-4cf3-8f07-d20ba7fef4b9" xlink:to="loc_us-gaap_CurrentForeignTaxExpenseBenefit_f79fb4bd-8829-48a2-8456-379e29be357d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_9d7eac60-4cb0-4eab-8ab5-bdb4674d3ac9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_5762a7af-9698-4557-becc-560405a0aa04" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsNet_9d7eac60-4cb0-4eab-8ab5-bdb4674d3ac9" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_5762a7af-9698-4557-becc-560405a0aa04" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_ab4071d8-c954-41ab-afe6-171a02bfdf99" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsNet_9d7eac60-4cb0-4eab-8ab5-bdb4674d3ac9" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_ab4071d8-c954-41ab-afe6-171a02bfdf99" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_c36b2d68-2805-4397-ad09-463a5da35490" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_7ae0c22f-f451-4af0-adf1-bf441387eb8f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_c36b2d68-2805-4397-ad09-463a5da35490" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_7ae0c22f-f451-4af0-adf1-bf441387eb8f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses_07250d4b-c93a-4d5e-b17f-a193ef43c6ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_c36b2d68-2805-4397-ad09-463a5da35490" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses_07250d4b-c93a-4d5e-b17f-a193ef43c6ac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_193c395d-08d4-430a-9749-a876e4b465c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_c36b2d68-2805-4397-ad09-463a5da35490" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_193c395d-08d4-430a-9749-a876e4b465c2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits_ad53d933-3cf4-4917-8e46-3f8b42751dee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_c36b2d68-2805-4397-ad09-463a5da35490" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits_ad53d933-3cf4-4917-8e46-3f8b42751dee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_c2229821-1fb3-455d-8693-b62f8db8cadf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_c36b2d68-2805-4397-ad09-463a5da35490" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_c2229821-1fb3-455d-8693-b62f8db8cadf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_3cc5c66e-434f-4b77-9b95-d4a44e1be8c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_c36b2d68-2805-4397-ad09-463a5da35490" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_3cc5c66e-434f-4b77-9b95-d4a44e1be8c2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_677836bb-8ed2-4b0b-91c5-cfd5e361af76" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_c36b2d68-2805-4397-ad09-463a5da35490" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_677836bb-8ed2-4b0b-91c5-cfd5e361af76" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther_285c2235-cdab-45a5-9a02-b6f64e266386" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_c36b2d68-2805-4397-ad09-463a5da35490" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther_285c2235-cdab-45a5-9a02-b6f64e266386" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent_ffda545d-0a5a-49c5-bbbc-36d983d9aa8c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_c36b2d68-2805-4397-ad09-463a5da35490" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent_ffda545d-0a5a-49c5-bbbc-36d983d9aa8c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_4fa52c28-b90b-4485-b347-83fa7c12ad32" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_cd8bae84-4223-4b88-900f-8be0f9f2f284" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_4fa52c28-b90b-4485-b347-83fa7c12ad32" xlink:to="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_cd8bae84-4223-4b88-900f-8be0f9f2f284" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_c8cbdbd2-3e40-42d5-a4b2-303826561b66" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_4fa52c28-b90b-4485-b347-83fa7c12ad32" xlink:to="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_c8cbdbd2-3e40-42d5-a4b2-303826561b66" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_8e31a144-1b39-462a-8b8a-99587bd61013" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_4fa52c28-b90b-4485-b347-83fa7c12ad32" xlink:to="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_8e31a144-1b39-462a-8b8a-99587bd61013" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_36415393-d6d4-4090-8750-7e4ffbfc362f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_c1dcc125-4b80-421e-beab-7c54f896170d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_36415393-d6d4-4090-8750-7e4ffbfc362f" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_c1dcc125-4b80-421e-beab-7c54f896170d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_dd9f7686-df3d-4da7-8999-dc75b5736f54" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_36415393-d6d4-4090-8750-7e4ffbfc362f" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_dd9f7686-df3d-4da7-8999-dc75b5736f54" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_6dd6f371-143a-432a-bc53-6a82837a3fca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther_1518c209-2f85-45ec-9ada-b92f2342f9b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_6dd6f371-143a-432a-bc53-6a82837a3fca" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther_1518c209-2f85-45ec-9ada-b92f2342f9b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_DeferredTaxAssetRightOfUseAsset_a7da89fe-3707-4506-98de-a4fec32883e1" xlink:href="lh-20231231.xsd#lh_DeferredTaxAssetRightOfUseAsset"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_6dd6f371-143a-432a-bc53-6a82837a3fca" xlink:to="loc_lh_DeferredTaxAssetRightOfUseAsset_a7da89fe-3707-4506-98de-a4fec32883e1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_794c37c3-fe10-4503-930a-8f57a59d18d1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsOther"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_6dd6f371-143a-432a-bc53-6a82837a3fca" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_794c37c3-fe10-4503-930a-8f57a59d18d1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges_a382074a-39e9-42e5-b8aa-b6bb25f2c457" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_6dd6f371-143a-432a-bc53-6a82837a3fca" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges_a382074a-39e9-42e5-b8aa-b6bb25f2c457" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts_5785a5b9-44a4-4221-ba1e-f3b84b69b2d6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_6dd6f371-143a-432a-bc53-6a82837a3fca" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts_5785a5b9-44a4-4221-ba1e-f3b84b69b2d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch_aaf57c33-a196-4611-9a69-85206275109e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_6dd6f371-143a-432a-bc53-6a82837a3fca" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch_aaf57c33-a196-4611-9a69-85206275109e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_4c54c2fa-2835-4073-b547-c1dbff766337" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_6dd6f371-143a-432a-bc53-6a82837a3fca" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_4c54c2fa-2835-4073-b547-c1dbff766337" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilities_ad940de4-14ad-4945-8f5e-d860ba7a15ce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_504a381e-7727-4a71-892f-4d52ee19d096" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_ad940de4-14ad-4945-8f5e-d860ba7a15ce" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilities_504a381e-7727-4a71-892f-4d52ee19d096" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_2d880cf1-ed4c-465e-bb53-f01e624d1f28" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_ad940de4-14ad-4945-8f5e-d860ba7a15ce" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_2d880cf1-ed4c-465e-bb53-f01e624d1f28" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.labcorp.com/role/PENSIONANDPOSTRETIREMENTPLANSDetails" xlink:type="simple" xlink:href="lh-20231231.xsd#PENSIONANDPOSTRETIREMENTPLANSDetails"/>
  <link:calculationLink xlink:role="http://www.labcorp.com/role/PENSIONANDPOSTRETIREMENTPLANSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bfa9d960-ad91-4180-ab44-a909a08ea494" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_d0d9420b-6a0e-4a1d-a583-0cf45febdcf0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bfa9d960-ad91-4180-ab44-a909a08ea494" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_d0d9420b-6a0e-4a1d-a583-0cf45febdcf0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_lh_DefinedBenefitPlanAmortizationAndDeferral_ad4760bb-6c96-44ad-9bcf-1cc102295b84" xlink:href="lh-20231231.xsd#lh_DefinedBenefitPlanAmortizationAndDeferral"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bfa9d960-ad91-4180-ab44-a909a08ea494" xlink:to="loc_lh_DefinedBenefitPlanAmortizationAndDeferral_ad4760bb-6c96-44ad-9bcf-1cc102295b84" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_c3719ab4-1483-49bf-bfca-6331ef4c4e1d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bfa9d960-ad91-4180-ab44-a909a08ea494" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_c3719ab4-1483-49bf-bfca-6331ef4c4e1d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_1477f3ca-904d-459e-a296-c23d0ec25dc3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bfa9d960-ad91-4180-ab44-a909a08ea494" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_1477f3ca-904d-459e-a296-c23d0ec25dc3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_44abdf10-e775-420d-aa8e-a561a1796077" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bfa9d960-ad91-4180-ab44-a909a08ea494" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_44abdf10-e775-420d-aa8e-a561a1796077" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
