EX-21.1 3 dgx12312023ex211.htm EX-21.1
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% Lab One, LLC (MO) | Quest Diagnostics LabOne, LLC of Kansas
| 100% Exam One 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% Lab One 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

1

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) |

2

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

3

| 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) |

4