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.

Accupath Diagnostic Laboratories, Inc.

Beacon Laboratory Benefit Solutions, Inc.

CannAmm GP Inc.

CannAmm Limited Partnership

Centrex Clinical Laboratories, Inc.

Clearstone Central Laboratories (Canada) Inc.

Clearstone Central Laboratories (China) Inc.

Clearstone Central Laboratories (Singapore) Pte. Ltd.

Clearstone Central Laboratories (U.S.) Inc.

Clearstone Holdings (International) Ltd.

Clipper Holdings, Inc.

Colorado Coagulation Consultants, Inc.

Consolidated Medical Services, 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 Diagnostic Laboratory Services

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.

Lab Delivery Service of New York City, Inc.

LabCorp Dialysis Services, Inc.

Labwest, Inc.

LabCorp BVBA

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

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 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

Trainor Laboratory

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.