Exhibit 21    LIST OF SUBSIDIARIES

1957285 Ontario Inc.

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.

BeaconLBS IPA, Inc.

CannAmm GP Inc.

CannAmm Limited Partnership

Center for Disease Detection, LLC

Centrex Clinical Laboratories, Inc.

Clearstone Central Laboratories (U.S.) Inc.

Clearstone Holdings (International) Ltd.

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 (DE)

DCL Sub LLC

Diagnostic Services, Inc.

DIANON Systems, Inc.

DL Holdings Limited Partnership

Dynacare - Gamma Laboratory Partnership (Gamma – Dynacare Medical Laboratories)

Dynacare Company

Dynacare G.P. Inc.

Dynacare Holdco LLC

Dynacare Laboratories Inc.

Dynacare Laboratories Arizona Inc.

Dynacare Laboratories Limited Partnership

Dynacare Northwest Inc.

Dynacare Southwest Laboratories Inc.

Dynacare Realty Inc.

DynaLIFEDx Infrastructure Inc.

Endocrine Sciences, Inc.

Esoterix Colorado Pathology Practice Group, P.C.

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, Inc.

La Jolla Management, Inc.

Lab Delivery Service of New York City, Inc.

LabCorp Belgium Holdings, Inc.

LabCorp BV

LabCorp Central Laboratories (Canada) Inc.

LabCorp Central Laboratories (China) Inc.

LabCorp Development Company

LabCorp Employer Services, Inc.

LabCorp Health System Diagnostics, LLC

LabCorp Japan, G.K.

Labcorp Kansas, Inc.

LabCorp Michigan, Inc.

LabCorp Nebraska, Inc.

LabCorp Neon Ltd.

Labcorp Neon Luxembourg Sarl

LabCorp Neon Switzerland S.à r.l.

Labcorp Oklahoma, Inc.

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

Laboratory Corporation of America Holdings

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.

Omniseq, Inc.

Ovuline, Inc.

PA Labs, Inc.

Path Lab Incorporated

Pathology Associates Medical Lab, LLC

Personal Genome Diagnostics Inc.

Persys Technology Inc.

Pixel by LabCorp

Princeton Diagnostic Laboratories of America, Inc.

Protedyne Corporation

Saint Joseph-PAML, LLC

Sequenom Center for Molecular Medicine, LLC

Sequenom, Inc.

SW/DL LLC

Tandem Labs Inc.

The LabCorp Charitable Foundation

Viro-Med Laboratories, Inc.

Visiun Inc.

Yakima Medical Arts, Inc.

Labcorp Drug Development Inc. Operating Entities 

Covance Genomics Laboratory LLC

Fairfax Storage Limited

Hazpen Trustees Ltd.

Labcorp Bedford LLC

Labcorp Bioanalytical Services LLC

Labcorp Central Laboratory Services Limited Partnership

Labcorp Central Laboratory Services S.à r.l.

Labcorp Clinical Development Limited

Labcorp Clinical Development Ltd.

Labcorp Development (Asia) Pte. Ltd.

Labcorp Development Inc.

Labcorp Early Development India Private Limited

Labcorp Early Development Laboratories Inc.

Labcorp Early Development Laboratories Limited

Labcorp Early Development Services GmbH

Labcorp Hong Kong Holdings Limited

Labcorp International Holdings B.V.

Labcorp International Holdings Limited

Labcorp Laboratories India Private Limited

Labcorp Laboratories Japan GK

Labcorp Laboratories S.L.

Labcorp Laboratories SASU

Labcorp Laboratories Sdn. Bhd.

Labcorp Laboratories sp. z o.o.

Labcorp Laboratories YH

Labcorp Luxembourg Sarl

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

Labcorp Pharmaceutical Research & Development (Shanghai) Co., Ltd. - Beijing Branch

Labcorp Pharmaceutical Research & Development (Shanghai) Co., Ltd. = Dalian Branch

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

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

Labcorp UK Holdings, Ltd. - Bulgarian Branch

Labcorp UK Limited

LSR Pension Scheme Limited

Labcorp Drug Development Inc. Inactive Entities

Covance NPA Inc.

Labcorp Global Specimen Solutions Inc.