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

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 International

Center for Disease Detection, LLC (Delaware)

Center for Disease Detection, LLC (Texas)

Centrex Clinical Laboratories, Inc.

Clearstone Central Laboratories (U.S.) Inc.

Clearstone Holdings (International) Ltd.

Clipper Holdings, Inc.

Colorado Coagulation Consultants, Inc.

Colorado Laboratory Services, LLC

Correlagen Diagnostics, Inc.

Curalab Inc.

Cytometry Associates, Inc.

Czura Thornton (Hong Kong) Limited

DCL Acquisition, Inc.

DCL Medical Laboratories, LLC (FL)

DCL Medical Laboratories, LLC (DE)

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 Corp.

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 Drug Development Inc. (f-Covance Inc.)

LabCorp Development Company

LabCorp Employer Services, Inc.

LabCorp Health System Diagnostics, LLC

LabCorp Indiana, Inc.

LabCorp Japan, G.K.

LabCorp Limited

LabCorp Michigan, Inc.

LabCorp Nebraska, Inc.

LabCorp Neon Ltd.

LabCorp Neon Switzerland S.à r.l.

LabCorp Specialty Testing Billing Service, Inc.

LabCorp Specialty Testing Group, Inc.

LabCorp Staffing Solutions, Inc.

LabCorp Tennessee, LLC

LabCorp UK Holdings, Ltd.

Laboratoire Bio-Medic Inc.

Laboratory Corporation of America

LabWest, Inc.

LipoScience, Inc.

Litholink Corporation

Medical Neurogenetics, LLC

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

Ovuline, Inc.

PA Labs, Inc.

Path Lab Incorporated

Pathology Associates Medical Lab, LLC

Persys Technology Inc.

Pixel by LabCorp

Princeton Diagnostic Laboratories of America, Inc.

Protedyne Corporation

Saint Joseph-PAML, LLC

Sequenom Biosciences (India) Pvt. Ltd.

Sequenom Center for Molecular Medicine, LLC

Sequenom, Inc.

Southern Idaho Regional Laboratory

SW/DL LLC

Tandem Labs Inc.

The LabCorp Charitable Foundation

Tri-Cities Laboratory, LLC

Viro-Med Laboratories, Inc.

Visiun Inc.

Yakima Medical Arts, Inc.

Labcorp Drug Development Inc. Operating Entities 

Chiltern International Limited (CIL)

Chiltern Pesquisa Clinica Ltda

CJB Inc.

Covance (Barbados) Holdings Ltd.

Covance (Barbados) Ltd.

Covance Classic Laboratory Services Inc.

Covance Korea Services Limited

Covance Periapproval Services Inc.

Covance Peru Services S.A.

Fairfax Storage Limited

Havenfern Ltd

Hazpen Trustees Ltd.

Labcorp (Argentina) S.A.

Labcorp (Canada) Inc.

Labcorp (Polska) Sp. z o.o.

Labcorp Asia-Pacific Inc.

Labcorp Austria GmbH

Labcorp Bioanalytical Services LLC

Labcorp Brazil Pharmaceutical Services Limitada

Labcorp Central Laboratory Services Inc.

Labcorp Central Laboratory Services Limited Partnership

Labcorp Central Laboratory Services S.à r.l.

Labcorp Chile Services Limitada

Labcorp Clinical Development (Pty) Ltd

Labcorp Clinical Development AG

Labcorp Clinical Development ApS

Labcorp Clinical Development GmbH

Labcorp Clinical Development Hungaria Consultancy Limited Liability Company

Labcorp Clinical Development Limited

Labcorp Clinical Development Limited

Labcorp Clinical Development Ltd.

Labcorp Clinical Development Private Limited

Labcorp Clinical Development SARL

Labcorp Clinical Development SRL

Labcorp Clinical Development SRL

Labcorp Clinical Development Ukraine LLC

Labcorp Clinical Development, S. DE R. L. De C.V.

Labcorp Clinical Research Unit Inc.

Labcorp Clinical Research Unit Limited

Labcorp Clinical Research, LP

Labcorp CLS Holdings Limited LLC

Labcorp CLS Holdings Partnership LP

Labcorp Colombia Services Ltda.

Labcorp CRU Inc.

Labcorp Data Sciences Ukraine LLC

Labcorp Development (Asia) Pte. Ltd.

Labcorp Development Japan K.K.

Labcorp Development Limited

Labcorp Development Pty Ltd

Labcorp Development S.A.U.

Labcorp Drug Development India Private Limited

Labcorp Early Development Corporation

Labcorp Early Development Laboratories Inc.

Labcorp Early Development Laboratories Limited

Labcorp Early Development Services GmbH

Labcorp Endpoint (UK) Ltd

Labcorp Endpoint Clinical Inc.

Labcorp Endpoint India Private Limited

Labcorp Global Specimen Solutions Inc.

Labcorp Guatemala Services, S.A.

Labcorp Hong Kong Holdings Limited

Labcorp Hong Kong Services Limited

Labcorp International Group Limited

Labcorp International Holdings B.V.

Labcorp International Holdings Limited

Labcorp Latin America Inc.

Labcorp Luxembourg Sarl

Labcorp Neon Luxembourg Sarl

Labcorp New Zealand Limited

Labcorp Peri-Approval and Commercialization Inc.

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

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

Labcorp Research Holdings, LLC

Labcorp Scientific Services & Solutions Private Limited

Labcorp Scientific Services and Solutions, Inc.

Labcorp Services (Thailand) Limited

Labcorp Services Malaysia Sdn. Bdn.

Labcorp Specialty Pharmacy LLC

Labcorp Taiwan Services Limited

Labcorp US Holdings Limited LLC

Labcorp US Holdings Partnership LP

LSR Pension Scheme Limited

Nexigent Inc.

Ockham Development Group (Holdings) UK Ltd

Ockham Europe Limited

PMD Properties, LLC

Reim LLC

SLJK LLC

SnapIoT Europe s.r.l.

SnapIOT, Inc.

SPHN, LLC

Texas Covance GP, Inc.

Theorem Clinical Research Holdings B.V.

Theorem Clinical Research International B.V

Theorem Clinical Research Latin America B.V.

Theorem Clinical Research Pte. Ltd.

Theorem Research Associates, Inc.

Labcorp Drug Development Inc. Inactive Entities

Covance NPA Inc.

Safe Foods International Holdings, LLC

Chiltern Research International (Hong Kong) Limited

Covance Genomics Laboratory LLC

JSG R&D LLC

Covance Clinical Development SRL

Theorem Clinical Research Co., Ltd.

Chiltern Clinical Research (Philippines) Inc

Chiltern International AB

Chiltern International Sro

Chiltern Investigacion Clinica Ltda

Covance Clinical and Periapproval Services LLC

Covance Consulting Limited

Covance CRS Analytics Ltd.

Covance CRS Developments Limited

Covance CRS International Limited

Covance Laboratories Korea Company Limited

Covance Pharma Consulting Limited

IFN Research, LLC

Integrated Development Associates Philippines, Inc

International Food Network LLC

Labcorp Research Limited

Labcorp UK Limited

Sciformix Europe Limited

The National Food Laboratory, LLC

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.