Exhibit 21    LIST OF SUBSIDIARIES

1957285 Ontario Inc. dba Quality Underwriting Services

2089729 Ontario, Inc.

2248848 Ontario Inc.

3065619 Nova Scotia Company

3257959 Nova Scotia Company

8165335 Canada Inc.

8348596 Canada Inc.

896988 Ontario Limited

9279-3280 Quebec Inc.

Accupath Diagnostic Laboratories, Inc.

Beacon Laboratory Benefit Solutions, Inc.

CannAmm GP Inc.

CannAmm Limited Partnership

Center for Disease Detection, LLC

Center for Disease Detection International

Centrex Clinical Laboratories, Inc.

Clearstone Central Laboratories (U.S.) Inc.

Clearstone Holdings (International) Ltd.

Clipper Holdings, Inc.

Colorado Coagulation Consultants, Inc.

Correlagen Diagnostics, Inc.

Covance Inc.

Curalab Inc.

Cytometry Associates, Inc.

Czura Thornton (Hong Kong) Limited

DCL Acquisition, Inc.

DCL Medical Laboratories, LLC

DCL Sub LLC

Decision Diagnostics, L.L.C. (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 Inc.

Dynacare Laboratories Limited Partnership

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

Health Trans Services Inc.

HHLA Lab-In-An-Envelope, LLC

Home Healthcare Laboratory of America, LLC

IDX Pathology, Inc.

Impact Genetics Corporation

Impact Genetics, Inc.

Kaleida LabCorp, LLC

Lab Delivery Service of New York City, Inc.

LabCorp Belgium Holdings, Inc.

LabCorp BVBA

LabCorp Central Laboratories (Canada) Inc.

LabCorp Central Laboratories (China) Inc.

LabCorp Development Company

LabCorp Health System Diagnostics, LLC

LabCorp Japan, G.K.

LabCorp Limited

LabCorp Nebraska, Inc.

LabCorp Neon Ltd.

LabCorp Neon Luxembourg S.à r.l.

LabCorp Specialty Testing Billing Service, Inc.

LabCorp Specialty Testing Group, Inc.

LabCorp Tennessee, LLC

LabCorp UK Holdings, Ltd.

Laboratoire Bio-Medic Inc.

Laboratory Corporation of America

LabWest, Inc.

LipoScience, Inc.

Litholink Corporation

MedAxio Insurance Medical Services GP Inc.

Medtox Diagnostics, Inc.

Medtox Laboratories, Inc.

MEDTOX Scientific, Inc.

Monogram Biosciences, Inc.

National Genetics Institute

New Brighton Business Center LLC

New Imaging Diagnostics, LLC

New Molecular Diagnostics Ventures LLC

NWT Inc.

Orchid Cellmark ULC

PA Labs, Inc.

Path Lab, Incorporated

Pathology Associates Medical Lab, LLC

Pee Dee Pathology Associates, Inc.

Persys Technology Inc.

Pixel by LabCorp

Princeton Diagnostic Laboratories of America, Inc.

Protedyne Corporation

Sequenom Biosciences (India) Pvt. Ltd.

Sequenom Center for Molecular Medicine, LLC

Sequenom, Inc.

SW/DL LLC

Tandem Labs Inc.

The Biomarker Factory, LLC

Viro-Med Laboratories, Inc.

Covance Inc. Active Entities

CJB Inc.

Covance (Argentina) S.A.

Covance (Asia) Pte. Ltd.

Covance (Barbados) Holdings Ltd.

Covance (Barbados) Ltd.

Covance (Canada) Inc.

Covance (Cayman) Holdings, Ltd

Covance (Cayman) Ltd

Covance (Polska) Sp.Zo.o

Covance Asia-Pacific Inc.

Covance Austria GmbH

Covance Bioanalytical Services LLC

Covance Brazil Pharmaceutical Services Limitada

Covance Central Laboratory Services Inc.

Covance Central Laboratory Services Limited Partnership

Covance Central Laboratory Services S.a r.l

Covance Chile Services Limitada

Covance Clinical and Periapproval Services AG

Covance Clinical and Periapproval Services GmbH

Covance Clinical and Periapproval Services Limited

Covance Clinical and Periapproval Services Limited

Covance Clinical and Periapproval Services LLC

Covance Clinical and Periapproval Services SA

Covance Clinical and Periapproval Services S.a r.l

Covance Clinical Development GmbH

Covance Clinical Development SA

Covance Clinical Development S.a r.l

Covance Clinical Development S.R.L.

Covance Clinical Development S.R.L.

Covance Clinical Product Developments Ltd.

Covance Clinical Research Unit Inc.

Covance Clinical Research Unit Limited

Covance Clinical Research, L.P.

Covance CLS Holdings Limited LLC

Covance CLS Holdings Partnership LP

Covance Colombia Services Limitada

Covance CRU Inc.

Covance Denmark ApS

Covance Development Services (Pty) Ltd

Covance Hong Kong Holdings Limited

Covance Hong Kong Services Limited

Covance Hungaria Consultancy Limited Liability Company

Covance India Pharmaceutical Services Private Limited

Covance International Holdings B.V.

Covance Japan Co., Ltd.

Covance Korea Services Limited

Covance Laboratories Inc.

Covance Laboratories Korea Company Limited

Covance Laboratories Limited

Covance Latin America Inc.

Covance Limited

Covance Luxembourg S.a r.l.

Covance Market Access Services Inc.

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

Covance Neon Luxembourg S.a r.l.

Covance New Zealand Limited

Covance Periapproval Services Inc.

Covance Peru Services S.A.

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

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

Covance Preclinical Corporation

Covance Preclinical Services GmbH

Covance Pty Ltd

Covance Research Holdings, LLC

Covance Research Products Inc.

Covance Services (Thailand) Limited

Covance Services Malaysia Sdn. Bhd.

Covance Specialty Pharmacy LLC

Covance Taiwan Services Limited

Covance US Holdings Limited LLC

Covance US Holdings Partnership LP

Covance Virtual Central Laboratory B.V.

CRPP Inc.

Fairfax Storage Limited

Global Specimen Solutions, Inc.

Hazpen Trustees Ltd.

Integrated Safe Foods Pte. Ltd.

Medaxial Limited

Sciformix Corporation

Sciformix Europe Limited

Sciformix Philippines, Inc.

Sciformix Technologies Private Limited

Texas Covance GP, Inc.

The Covance Charitable Foundation

Covance Inc. Inactive Entities

Covance Classic Laboratory Services Inc.

Covance Genomics Laboratory LLC

PMD Properties, LLC

SLJK LLC

REIM LLC

SPHN LLC

JSG R&D LLC

Nexigent Inc.

Covance NPA Inc.

Chiltern International Group Limited Operating Entities

Chiltern Clinical Research KK

Chiltern Clinical Research S.R.L.

Chiltern Clinical Research YH

Chiltern Clinical Research India Private Limited

Chiltern Clinical Research (Philippines) Inc.

Chiltern Clinical Research Ukraine LLC

Chiltern International AB

Chiltern International B.V.

Chiltern International BVBA

Chiltern International EOOD

Chiltern International Kft.

Chiltern International LLC

Chiltern International Ltd.

Chiltern International S.R.L.

Chiltern International Sp.z.o.o.

Chiltern International Sro

Chiltern International (Canada) Ltd.

Chiltern International (Hong Kong) Limited

Chiltern International Group Limited

Chiltern International Holdings Limited

Chiltern International Limited

Chiltern International Portugal LDA

Chiltern International Pty Ltd

Chiltern International Switzerland SARL

Chiltern International Taiwan Ltd

Chiltern International Ukraine LLC

Chiltern Investigacion Clinica Limitada

Chiltern Klinik Arastirma Organizasyon Limited Sirketi

Chiltern - Pesquisa Clinica Ltda.

Chiltern Research International Pty Ltd.

Chiltern Pharmaceutical and Technology Consulting (Shanghai) Co. Ltd.

Chiltern Research International (Singapore) Pte. Ltd.

Endpoint Clinical, Inc.

Endpoint Clinical India Private Limited

Endpoint Clinical (UK) Limited

Havenfern Limited

Integrated Development Associates Co., Ltd.

Integrated Development Associates Philippines, Inc.

Pacific Clinical Research India Private Limited

Ockham Development Group (Holdings) UK Limited

Ockham Europe Limited

Ockham India Clinical Research and Data Services Private Limited

Theorem Clinical Latin America B.V.

Theorem Clinical Research Co., Ltd.

Theorem Clinical Research K.F.T.

Theorem Clinical Research Limited

Theorem Clinical Research L.L.C.

Theorem Clinical Research Holdings B.V.

Theorem Clinical Research International B.V.

Theorem Research Associates, Inc.

Theorem Clinical Research S.A.

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.