EXHIBIT 21

LIST OF SUBSIDIARIES OF THE COMPANY

2089279 Ontario, Inc.

3065619 Nova Scotia Co.

3241287 Nova Scotia Company

3901858 Canada Inc.

591893 Alberta Ltd.

896988 Ontario Inc.

Accupath Diagnostics Laboratories, Inc dba US LABS

Allergy Testing Laboratories, Inc.

Applied Genetics, Inc.

Center for Genetic Services, Inc.

Centrex Clinical Laboratories, Inc.

Clinical Laboratories Cheyenne

Clinical Laboratories, Inc.

Clipper Holdings Inc. (Clipper)

Colorado Coagulation Consultants, Inc.

Cytometry Associates, Inc.

Decision Diagnostics LLC (aka DaVinici/Medicorp LLC)

Diagnostic Services, Inc.

DIANON Systems, Inc.

DL/UHS, Inc.

Dynacare - Gamma Medical Laboratories

Dynacare Company

Dynacare G.P. Inc.

Dynacare Holdco LLC

Dynacare Kasper Medical Laboratories (Northern Alberta) Inc.

Dynacare Kasper Medical Laboratories Inc.

Dynacare Kasper Medical Sales Inc.

Dynacare Laboratories Limited Partnership

Dynacare Laboratories, Inc.

Dynacare Northwest Inc.

Dynacare Realty Inc.

Dynacare Southwest Laboratories, Inc.

DynaLifeDX Diagnostic Laboratory Services

Endocrine Sciences, Inc.

Esoterix BV

Esoterix Clinical Trials Services BVBA (“Esoterix BVBA”)

Esoterix Molecular Genetics, Inc.

Esoterix, Inc.

Execmed Health Services Inc.

Faxchil Realty, Inc.

GDML Medical Laboratories Inc

Glen Ames LLP

HH/DL LP

HHD Gen Par Inc.

HHLA Lab-In-An-Envelope, LLC

Home Healthcare Laboratory of America, LLC

IDX Pathology, Inc

Lab Delivery Service of New York City, Inc.

LabCorp Development Company

LabCorp Limited

Laboratory Corporation of America (LCA)

Laboratory Corporation of America Holdings (LCAH)

LDS Diagnostic Laboratories Inc

Litholink Corporation

Long Beach Genetics, Inc.

MD Datacor Inc.

Medical Account Services, Inc.

Monogram Biosciences, Inc.

Monogram Biosciences – France SAS

Monogram Biosciences UK Limited

National Genetics Institute

New Imaging Diagnostics LLC

New Molecular Diagnostics Ventures LLC

NWT Inc

PA Labs Inc.

Path Lab Holdings, Inc.

Path Lab, Inc. d/b/a LabCorp

Persys Technology Inc.

Protedyne Corporation

Protedyne Ltd.

RD Belenger & Associates Ltd. - 70% ownership by Dynacare-Gamma

SW/DL LP

Tandem Labs, Inc.

The Biomarker Factory, LLC

The Esoterix Center for Clinical Trials, Inc.

The Esoterix Center for Infectious Disease, Inc.

Tri-State Clinical Laboratory Services, LLC

UHS/DL, LP

United/Dynacare LLC

US Labs Fountain Valley Inc.

US Labs, Inc.

US Pathology Labs, Inc.

Viro-Med Laboratories, Inc.

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

1004679 Ontario Limited

3024539 Nova Scotia Company

563911 Ontario Limited

591893 Alberta Ltd.

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.

Dynacare US Financing LLC

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.