Top 20 clinical medical laboratories

Clinical medical laboratories are healthcare facilities that provide a wide range of laboratory procedures that help healthcare providers (HCP) diagnose, treat and manage patient health. These facilities may also be referred to as medical testing labs.

The scope of medical laboratory science includes collecting and processing specimens, performing an array of analytical procedures, quality control and reporting on test results.

How many laboratory procedures are performed each year?

Definitive Healthcare tracks laboratory, durable medical equipment (DME) and medical supply orders in our PhysicianView product. This data is a subset of medical claims that capture when providers order additional testing from pathology laboratories or DME for their patients. For this Healthcare Insight, we reviewed more than 911 million claims for laboratory procedures performed in 2021 and grouped them by clinical medical laboratory facility to identify the top 20.

The following are the top clinical medical laboratories by 2021 procedure volume.

2021 Top 20 clinical medical laboratories

Rank Billing facility Facility NPI Facility City Facility State 2021 Procedure Volume
1 UNILAB CORPORATION 1366479099 WEST HILLS CA 18,871,154
2 CLINICAL PATHOLOGY LABORATORIES, INC. 1194769497 AUSTIN TX 13,311,523
3 LABORATORY CORPORATION OF AMERICA 1659352276 SAN DIEGO CA 7,478,220
4 LABORATORY CORPORATION OF AMERICA HOLDINGS 1063497451 RARITAN NJ 7,154,279
5 BIOREFERENCE HEALTH, LLC 1134277494 ELMWOOD PARK NJ 7,078,004
6 LABORATORY CORPORATION OF AMERICA HOLDINGS 1538144910 BURLINGTON NC 6,108,633
7 QUEST DIAGNOSTICS INCORPORATED 1932145778 CLIFTON NJ 5,519,215
8 ACCU REFERENCE MEDICAL LAB, LLC 1225110497 LINDEN NJ 4,878,422
9 CENTERS LAB NJ LLC 1598315574 CEDAR KNOLLS NJ 4,448,853
10 HEALTHTRACKRX INDIANA, INC 1689639544 DENTON TX 4,058,678
11 SEMA4 OPCO, INC 1518415991 BRANFORD CT 3,593,277
12 West Coast Medical Diagnostic Services Inc 1114431087 LOS ANGELES CA 3,486,563
13 LABORATORY CORPORATION OF AMERICA HOLDINGS 1932184322 DUBLIN OH 3,483,926
14 SONORA QUEST LABORATORIES, LLC. 1538105366 PHOENIX AZ 3,246,116
15 QUEST DIAGNOSTICS CLINICAL LABORATORIES INC 1790721538 IRVING TX 3,240,870
16 PATHGROUP LABS, LLC 1235186800 NASHVILLE TN 3,136,800
17 EMPIRE CITY LABORATORIES, INC 1053584482 BROOKLYN NY 3,047,612
18 LABORATORY CORPORATION OF AMERICA 1104829159 BURLINGTON NC 3,032,196
19 OhioHealth Riverside Methodist Hospital 1710916945 COLUMBUS OH 2,993,250
20 MILLENNIUM HEALTH, LLC 1497933162 SAN DIEGO CA 2,704,582

Fig. 1 Data from the Definitive Healthcare PhysicianView and ClaimsMx products for calendar year 2021. Claims data is sourced from multiple medical claims clearinghouses in the U.S. and is updated monthly. Data is accurate as of June 2022.

Which clinical medical laboratory performed the most procedures in 2021?

Unilab Corporation, based in West Hills, CA performed the most laboratory procedures in 2021 with almost 19 million total procedures. Clinical Pathology Laboratories, Inc in Austin, TX has the second highest volume of procedures at more than 13 million total procedures performed in 2021. Both facilities performed significantly greater volumes of procedures than the remaining clinical medical laboratories on the top 20 list.

Laboratory Corporation of America holds 5 of the top 20 places on our list due to different NPI numbers. If we combine those 5 site locations, the total volume amounts to over 27 million procedures performed in 2021.

This list is representative of where the testing is performed and not inclusive of the collection site. Laboratory testing is not performed exclusively in these clinical medical laboratories but can also be executed through general acute care hospitals, anatomic pathology & clinical pathology labs and other facility types. However, clinical and medical laboratories are the most prevalent and are capable of handling large volumes.

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