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				<link:definition>006010 - Disclosure - 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</link:definition>
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				<link:definition>011000 - Disclosure - EARNINGS PER SHARE</link:definition>
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				<link:usedOn>link:calculationLink</link:usedOn>
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				<link:definition>006030 - Disclosure - 3. RESTRUCTURING AND OTHER SPECIAL CHARGES</link:definition>
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				<link:definition>006040 - Disclosure - 4. RESTRUCTURING RESERVES</link:definition>
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				<link:definition>011001 - Disclosure - BAD DEBT EXPENSE</link:definition>
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				<link:definition>011002 - Disclosure - NONCONTROLLING INTEREST PUT</link:definition>
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				<link:definition>006080 - Disclosure - 8. GOODWILL AND INTANGIBLE ASSETS</link:definition>
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				<link:definition>006110 - Disclosure - 11. DEBT</link:definition>
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				<link:definition>006120 - Disclosure - 12. PREFERRED STOCK AND COMMON SHAREHOLDERS' EQUITY</link:definition>
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				<link:definition>006130 - Disclosure - 13. INCOME TAXES</link:definition>
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				<link:definition>011003 - Disclosure - NEW ACCOUNTING PRONOUNCEMENTS</link:definition>
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				<link:definition>006150 - Disclosure - 15. COMMITMENTS AND CONTINGENT LIABILITIES</link:definition>
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			<link:roleType roleURI="http://labcorp.com/role/PensionAndPostretirementPlans" id="PensionAndPostretirementPlans">
				<link:definition>006160 - Disclosure - 16. PENSION AND POSTRETIREMENT PLANS</link:definition>
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			<link:roleType roleURI="http://labcorp.com/role/SupplementalCashFlowInformation" id="SupplementalCashFlowInformation">
				<link:definition>006200 - Disclosure - 20. SUPPLEMENTAL CASH FLOW INFORMATION</link:definition>
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				<link:definition>006170 - Disclosure - 17. FAIR VALUE MEASUREMENTS</link:definition>
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				<link:definition>006180 - Disclosure - 18. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES</link:definition>
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				<link:usedOn>link:calculationLink</link:usedOn>
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			<link:roleType roleURI="http://labcorp.com/role/PROPOSEDACQUISITION" id="PROPOSEDACQUISITION">
				<link:definition>011005 - Disclosure - PROPOSED ACQUISITION</link:definition>
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				<link:usedOn>link:calculationLink</link:usedOn>
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			<link:roleType roleURI="http://labcorp.com/role/ConsolidatedBalanceSheets" id="ConsolidatedBalanceSheets">
				<link:definition>001000 - Statement - CONSOLIDATED BALANCE SHEETS</link:definition>
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				<link:usedOn>link:calculationLink</link:usedOn>
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			<link:roleType roleURI="http://labcorp.com/role/ConsolidatedStatementsOfOperations" id="ConsolidatedStatementsOfOperations">
				<link:definition>002000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS</link:definition>
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				<link:usedOn>link:calculationLink</link:usedOn>
				<link:usedOn>link:definitionLink</link:usedOn>
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			<link:roleType roleURI="http://labcorp.com/role/ConsolidatedStatementsOfCashFlows" id="ConsolidatedStatementsOfCashFlows">
				<link:definition>004000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
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				<link:usedOn>link:calculationLink</link:usedOn>
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			<link:roleType roleURI="http://labcorp.com/role/ParentheticalDataToTheConsolidatedBalanceSheets" id="ParentheticalDataToTheConsolidatedBalanceSheets">
				<link:definition>001100 - Statement - PARENTHETICAL DATA TO THE CONSOLIDATED BALANCE SHEETS</link:definition>
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				<link:usedOn>link:calculationLink</link:usedOn>
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			<link:roleType roleURI="http://labcorp.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" id="ConsolidatedStatementsOfChangesInShareholdersEquity">
				<link:definition>003000 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY</link:definition>
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				<link:usedOn>link:calculationLink</link:usedOn>
				<link:usedOn>link:definitionLink</link:usedOn>
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			<link:roleType roleURI="http://labcorp.com/role/BusinessAcquisitions" id="BusinessAcquisitions">
				<link:definition>006020 - Disclosure - 2. BUSINESS ACQUISITIONS</link:definition>
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				<link:usedOn>link:calculationLink</link:usedOn>
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			<link:roleType roleURI="http://labcorp.com/role/InvestmentsInJointVenturePartnerships" id="InvestmentsInJointVenturePartnerships">
				<link:definition>006050 - Disclosure - 5. INVESTMENTS IN JOINT VENTURE PARTNERSHIPS</link:definition>
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				<link:usedOn>link:calculationLink</link:usedOn>
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			<link:roleType roleURI="http://labcorp.com/role/AccountsReceivableNet" id="AccountsReceivableNet">
				<link:definition>006060 - Disclosure - 6. ACCOUNTS RECEIVABLE, NET</link:definition>
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				<link:usedOn>link:calculationLink</link:usedOn>
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			<link:roleType roleURI="http://labcorp.com/role/PropertyPlantAndEquipmentNet" id="PropertyPlantAndEquipmentNet">
				<link:definition>006070 - Disclosure - 7. PROPERTY, PLANT AND EQUIPMENT, NET</link:definition>
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				<link:usedOn>link:calculationLink</link:usedOn>
				<link:usedOn>link:definitionLink</link:usedOn>
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			<link:roleType roleURI="http://labcorp.com/role/AccruedExpensesAndOther" id="AccruedExpensesAndOther">
				<link:definition>006090 - Disclosure - 9. ACCRUED EXPENSES AND OTHER</link:definition>
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				<link:usedOn>link:definitionLink</link:usedOn>
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				<link:definition>006100 - Disclosure - 10. OTHER LIABILITIES</link:definition>
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				<link:usedOn>link:calculationLink</link:usedOn>
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			<link:roleType roleURI="http://labcorp.com/role/StockCompensationPlans" id="StockCompensationPlans">
				<link:definition>006140 - Disclosure - 14. STOCK COMPENSATION PLANS</link:definition>
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			<link:roleType roleURI="http://labcorp.com/role/ExecutiveRetirement" id="ExecutiveRetirement">
				<link:definition>006190 - Disclosure - 19. EXECUTIVE RETIREMENT</link:definition>
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			<link:roleType roleURI="http://labcorp.com/role/QuarterlyData" id="QuarterlyData">
				<link:definition>006210 - Disclosure - 21. QUARTERLY DATA (UNAUDITED)</link:definition>
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			<link:roleType roleURI="http://labcorp.com/role/ValuationAndQualifyingAccountsAndReserves" id="ValuationAndQualifyingAccountsAndReserves">
				<link:definition>006220 - Schedule - Valuation And Qualifying Accounts And Reserves</link:definition>
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				<link:usedOn>link:calculationLink</link:usedOn>
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