Exhibit 21    LIST OF SUBSIDIARIES

2089729 Ontario, Inc.

2248848 Ontario Inc.

3065619 Nova Scotia Company

3257959 Nova Scotia Company

3901858 Canada, Inc.

896988 Ontario Inc.

9279-3280 Quebec Inc.

Accupath Diagnostic Laboratories, Inc.

Accuro Inc.

Beacon Laboratory Benefit Solutions, Inc.

CannAmm GP Inc.

CannAmm Limited Partnership

Cellmark Forensics, Inc.

Centrex Clinical Laboratories, Inc.

Clearstone Central Laboratories (Canada) Inc.

Clearstone Central Laboratories (China) Inc.

Clearstone Central Laboratories (U.S.) Inc.

Clearstone Holdings (International) Ltd.

Clipper Holdings, Inc.

Colorado Coagulation Consultants, Inc.

Correlagen Diagnostics, Inc.

Cytometry Associates, Inc.

Czura Thornton (Hong Kong) Limited

DCL Acquisition, Inc.

DCL Medical Laboratories, LLC

DCL Sub LLC

Decision Diagnostics, LLC (aka DaVinici/Medicorp LLC)

Diagnostic Services, Inc.

DIANON Systems, Inc.

DL Holdings Limited Partnership

Dynacare - Gamma Laboratory Partnership

Dynacare Company

Dynacare G.P. Inc.

Dynacare Holdco LLC

Dynacare Laboratories Limited Partnership

Dynacare Laboratories Inc.

Dynacare Northwest Inc.

Dynacare Realty Inc.

DynaLifeDX

DynalifeDX Infrastructure Inc.

Endocrine Sciences, Inc.

Esoterix Genetic Counseling, LLC

Esoterix Genetic Laboratories, LLC

Esoterix, Inc.

Execmed Health Services Inc.

FirstSource Laboratory Solutions, Inc.

Gamma-Dynacare Central Medical Laboratories GP Inc.

Gamma-Dynacare Central Medical Laboratory Limited Partnership

GDML Medical Laboratories Inc

GeneScreen, Inc.

Glen Ames LLP

HHLA Lab-In-An-Envelope, LLC

Home Healthcare Laboratory of America, LLC

IDX Pathology, Inc.

Impact Genetics, Inc.

Lab Delivery Service of New York City, Inc.

LabCorp Dialysis Services, Inc.

LabCorp BVBA

LabCorp Clinical Trials (Singapore) Pte. Ltd.

LabCorp Development Company

LabCorp Japan, G.K.

LabCorp Limited

LabCorp Specialty Testing Billing Service, Inc.

LabCorp Specialty Testing Group, Inc.

LabCorp Tennessee, LLC

Laboratory Corporation of America (LCA)

Laboratory Corporation of America Holdings (LCAH)

LCAH Clipper, LP

LDS Diagnostic Laboratories Inc

Lifecodes Corporation

Litholink Corporation

MedAxio Insurance Medical Services GP Inc.

MedAxio Insurance Medical Services LP

Medtox Diagnostics, Inc.

Medtox Laboratories, Inc.

Medtox Scientific, Inc.

Monogram Biosciences, Inc.

Monogram Biosciences UK Limited

National Genetics Institute

New Brighton Business Center LLC

New Imaging Diagnostics, LLC

New Molecular Diagnostics Ventures LLC

NWT Inc.

Orchid Cellmark Ltd.

Orchid Cellmark ULC

PA Labs, Inc.

Path Lab Incorporated

Persys Technology Inc.

Princeton Diagnostic Laboratories of America, Inc.

Protedyne Corporation

ReliaGene Technologies, Inc.

Rix Ltd.

SW/DL LLC

Tandem Labs Inc.

The Biomarker Factory, LLC

United/Dynacare LLC

Viro-Med Laboratories, Inc.

Dynacare non-operating entities identified subsequent to the acquisition of Dynacare Inc. on July 25, 2002

1004679 Ontario Limited

563911 Ontario Limited

794475 Ontario Inc.

829318 Ontario Limited

854512 Ontario Limited

879606 Ontario Limited

900747 Ontario Ltd.

925893 Ontario Limited

942487 Ontario Ltd.

942489 Ontario Ltd.

942491 Ontario Limited

942492 Ontario Ltd.

947342 Ontario Ltd.

949235 Ontario Ltd.

958069 Ontario Inc.

977681 Ontario Inc.

978550 Ontario Ltd.

978551 Ontario Ltd.

Amherstview Medical Centre Developments Inc.

DHG Place Du Centre Clinique

Dynacare Canada Inc.

Dynacare International Inc.

Glen Davis Equities Ltd.

L.R.C. Management Service Inc.

Lawrence-Curlew Medical Centre Inc.

Roselat Developments Limited

St. Joseph's Health Centre

Stockwin Corporation Ltd.

Thistle Place Care Corp.

Toronto Argyro Medical Laboratories Ltd.

Woodstock Medical Arts Building Inc.

Covance, Inc. Subsidiaries

CJB, Inc.

Covance (Argentina) SA

Covance (Asia) Pte. Ltd.

Covance (Canada) Inc.

Covance Antibody Services Inc.

Covance Asia-Pacific Inc.

Covance Bioanalytical Services Inc.

Covance Central Laboratory Services Limited Partnership

Covance Central Laboratory Services SA

Covance Central Laboratory Services Inc.

Covance Clinical and Periapproval Services AG

Covance Clinical and Periapproval Services GmbH

Covance Clinical and Periapproval Services Limited

Covance Clinical and Periapproval Services LLC

Covance Clinical and Periapproval Services SA

Covance Clinical and Periapproval Services SARL

Covance Clinical Research Unit AG

Covance Clinical Research Unit Inc.

Covance Clinical Research Unit Ltd.

Covance Clinical Research, L.P.

Covance CRU Inc

Covance Development Services (Pty) Ltd.

Covance Genomics Laboratory LLC

Covance Hong Kong Holdings Limited

Covance Hungária Consultancy Limited Liability Company

Covance International Holdings B.V.

Covance Japan Co. Ltd.

Covance Laboratories GmbH

Covance Laboratories Limited

Covance Laboratories Inc.

Covance Laboratory

Covance Latin America Inc.

Covance Limited

Covance Market Access Services Inc.

Covance Periapproval Services Inc.

Covance Pharmaceutical Research and Development (Beijing) Co. Ltd.

Covance Pharmaceutical Research and Development (Shanghai) Co. Ltd.

Covance (Polska) Sp.Zo.

Covance Preclinical Corporation

Covance Pty. Ltd.

Covance Research Holdings, LLC

Covance Research Products Inc.

Covance Specialty Pharmacy LLC

Texas Covance GP, Inc.

Covance Austria GmbH

Covance Brazil Pharmaceutical Services Limitada

Covance Chile Services Limitada

Covance Hong Kong Services Limited

Covance Classic Laboratory Services Inc.

Covance Clinical and Periapproval Services Limited

Covance Clinical Product Developments Ltd.

Covance Colombia Services Limitada

Covance Denmark Aps

Covance India Pharmaceutical Services Private Limited

Covance Korea Services Limited

Covance Laboratories Korea Company Limited

Medaxial Limited

Covance Services Malaysia Sdn. Bhd.

Covance Mexico Services, S. DE R. L. De C.V.

Covance New Zealand Limited

Covance Peru Services S.A.

CRPP Inc.

Covance Services (Thailand) Limited

Covance Taiwan Services Limited

Covance Virtual Central Laboratory B.V.

DKJR LLC (assumed name for SLJK LLC in Texas)

Fairfax Storage Limited

PMD Properties, LLC

SLJK LLC

REIM LLC

SPHN LLC

Hazpen Trustees Ltd

JSG R&D LLC

Nexigent Inc