Exhibit 21.1

Quest Diagnostics Incorporated (DE)

(Incorporated on December 12, 1990 in Delaware; EIN: 16-1387862)

Subsidiaries, Joint Ventures and Affiliates

Company							Registered Alternate name
100% Quest Diagnostics Holdings Incorporated (DE)
	100% Quest Diagnostics International Holdings Limited (UK)
		100% Quest Diagnostics Holdings Ltd. (UK)
				100% ExamOne Canada, Inc. (New Brunswick)
				99.9% Quest Diagnostics HTAS India Private Limited (India) (0.1% Quest Diagnostics International Holdings Limited (UK)
				100% Quest Diagnostics of Puerto Rico, Inc. (PR)
				100% Quest Diagnostics Ireland Limited (Ireland)
				100% Quest Diagnostics (Shanghai) Co., Ltd. (China)
	100% Quest Diagnostics Clinical Laboratories, Inc. (DE)						Advanced Toxicology Network Quest Diagnostics Solstas Lab Partners Group Solstas Lab Partners Smithkline Beecham Clinical    Laboratories
			100% Quest Consumer Inc. (DE)
			100% LabOne, LLC (MO)				Quest Diagnostics LabOne, LLC of Kansas
					100% ExamOne World Wide, Inc. (PA)
						100% ExamOne LLC (DE)
						100% ExamOne World Wide of NJ, Inc. (NJ)
						51% DGXWMT JV, LLC (DE)
						100% PACK Health, LLC (AL)	PACK Health Enterprise LLC
						100% Quest HealthConnect, LLC (CA)
						100% Quest Diagnostics Health & Wellness, LLC (DE)
					100% LabOne of Ohio, Inc. (DE)		Quest Diagnostics LabOne
			51% Diagnostic Laboratory of Oklahoma LLC (OK)
			49% Sonora Quest Laboratories LLC (AZ)
100% Quest Diagnostics do Brasil Ltda. (Brazil)
100% Quest Diagnostics Incorporated (MD)
100% Quest Diagnostics India Private Limited (India)
100% Quest Diagnostics International LLC (DE)
100% Quest Diagnostics Investments LLC (DE)
100% Quest Diagnostics LLC (IL)							Quest Diagnostics LLC

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100% Quest Diagnostics LLC (MA)			Quest Diagnostics LLC Quest Diagnostics of Connecticut LLC
	81.1% Quest Diagnostics Massachusetts LLC (MA)
100% Quest Diagnostics LLC (CT)
99.9% Quest Diagnostics Mexico, S de RL de CV (Mexico) (0.1% Quest Diagnostics Holdings Incorporated (DE))
100% Quest Diagnostics Nichols Institute (CA)			Nichols Institute Quest Diagnostics Nichols    Institute (CA) Inc. Quest Diagnostics Nichols    Institute Inc.
100% Quest Diagnostics of Pennsylvania Inc. (DE)
	51% Quest Diagnostics Venture LLC (PA)
	53.5% Associated Clinical Laboratories of Pennsylvania, L.L.C. (PA)
		1% Associated Clinical Laboratories, L.P. (PA)
	52.97% Associated Clinical Laboratories, L.P. (PA)
100% Quest Diagnostics Receivables Inc. (DE)
100% Quest Diagnostics TB, LLC (DE)
100% American Medical Laboratories, Incorporated (DE)
	100% Quest Diagnostics Nichols Institute, Inc. (VA)		Nichols Institute Quest Diagnostics Quest Diagnostics Nichols Institute,    Institute, Inc. of Virginia
	100% Quest Diagnostics Incorporated (NV)		Quest Diagnostics Incorporated of Nevada Quest Diagnostics
100% Blueprint Genetics Inc. (DE)			Athena Diagnostics
100% Blueprint Genetics Oy (Finland)
	100% Blueprint Genetics FZ-LLC (UAE)
100% Cleveland HeartLab, Inc. (DE)			Cleveland Heartlab Services, Inc.
100% Haystack Oncology, Inc. (DE)
	100% Haystactack Oncology GmbH (Germany)
100% Isabella Street Urban Renewal, LLC (NJ)
100% Med Fusion, LLC (TX)			med fusion med fusion clin-trials med fusion clin-labs
100% Reprosource Fertility Diagnostics, Inc. (MA)

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100% Unilab Corporation (DE)			Quest Diagnostics
100% AmeriPath, Inc. (DE)
	100% AmeriPath Cincinnati, Inc. (OH)		Richfield Laboratory of Dermatopathology
	100% AmeriPath Cleveland, Inc. (OH)		AmeriPath GI Institute Dermpath Diagnostics
	100% AmeriPath Consolidated Labs, Inc. (FL)
	100% AmeriPath Florida, LLC (DE)		AmeriPath Central Florida AmeriPath Northeast Florida AmeriPath Southwest Florida Bay Area Dermatopathology Dermpath Diagnostics Dermpath Diagnostics Bay Area Dermpath Diagnostics    South Florida Institute for Immunofluorescence Institute for Podiatric Pathology
	100% AmeriPath Hospital Services Florida, LLC (DE)
	100% AmeriPath Kentucky, Inc. (KY)
	100% AmeriPath Lubbock 5.01(A) Corporation (TX)		Arlington Pathology Associates Dermpath Diagnostics Texas North Arlington Pathology    Associates Pathology Associates of Texas
	100% AmeriPath New York, LLC (DE)		AmeriPath East AmeriPath Gastrointestinal Diagnostics AmeriPath Northeast Dermpath Diagnostics Dermpath Diagnostics     NE-Braintree Ackerman Academy of Dermatopathology Dermpath Diagnostics New York
	100% AmeriPath Texas Inc. (DE)
	100% AmeriPath Tucson, Inc. (AZ)		AmeriPath Arizona
	100% Consolidated DermPath, Inc. (DE)
	100% DFW 5.01(a) Corporation (TX)		AmeriPath North Texas AmeriPath Dallas AmeriPath DFW 5.01(a)    Corporation
	100% Diagnostic Pathology Services, Inc. (OK)		AmeriPath Oklahoma
	100% Kailash B. Sharma, M.D., Inc. (GA)
		100% Nuclear Medicine and Pathology Associates (GA)
	100% Institute for Dermatopathology, Inc. (PA)		AmeriPath Mid Atlantic Dermpath Diagnostics The Dermatopathology    Laboratory
	100% Ocmulgee Medical Pathology Association, Inc. (GA)		AmeriPath Georgia Gastrointestinal Diagnostics Dermpath Diagnostics

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	100% Specialty Laboratories, Inc. (CA)	Quest Diagnostics Nichols    Institute of Valencia, Inc.
Additional Entities Consolidated for Accounting Purposes
AmeriPath Indianapolis, PC (IN)		AmeriPath Indianapolis, PSC AmeriPath Indianapolis Medical    Pathology Dermpath Diagnostics
Colorado Pathology Consultants, P.C. (CO)		AmeriPath Colorado Dermpath Diagnostics
Dermatopathology of Wisconsin, S.C. (WI)		AmeriPath Great Lakes
Hoffman, M.D., Associated Pathologists, Chartered (NV)		Associated Pathologists,    Chartered APC at Liberation Drive
Kilpatrick Pathology, P.A. (NC)
PhenoPath Laboratories, PLLC (WA)

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