Company lists · Data refreshed September 2026

Top 25 Laboratory testing companies based in the United States

Name: Laboratory testing companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 2,505 companies tracked

RevenueBase identified 2,505 laboratory testing companies headquartered in the United States as of September 2026 and tracks 320,995 professional contacts across them, including 104,958 with verified work emails. Houston is the largest hub.

This list covers laboratory testing companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

2,505Companies

320,995Contacts tracked

104,958Verified emails

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The 25 largest laboratory testing companies based in the United States

Ranked by team size

Top 25 of 2,505 laboratory testing companies based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to laboratory testing companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Thermo Fisher Scientific	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	10001+	70,907 contacts →
	Indirect evidence “About Thermo Fisher Scientific Thermo Fisher Scientific Inc.” Source: RevenueBase Database · checked Sep 20, 2026
2	Agilent Technologies	Indirect evidence	Santa Clara, CA, United StatesHQ checked Sep 20, 2026	10001+	48,455 contacts →
	Indirect evidence “Agilent customers are finding new ways to treat cancer, ensure food, water, air, and medicine quality and safety, discover new drug treatments, research infectious diseases, and…” Source: RevenueBase Database · checked Sep 20, 2026
3	Labcorp	Indirect evidence	Burlington, NC, United StatesHQ checked Sep 20, 2026	10001+	38,427 contacts →
	Indirect evidence “Clear and confident health care decisions begin with questions.” Source: RevenueBase Database · checked Sep 20, 2026
4	Quest Diagnostics	Indirect evidence	Secaucus, NJ, United StatesHQ checked Sep 20, 2026	10001+	27,884 contacts →
	Indirect evidence “Quest Diagnostics (NYSE: DGX) empowers people to take action to improve health outcomes.” Source: RevenueBase Database · checked Sep 20, 2026
5	Beckman Coulter Diagnostics	Partial evidence	Brea, CA, United StatesHQ checked Sep 20, 2026	10001+	10,069 contacts →
	Partial evidence “A global leader in advanced diagnostics, Beckman Coulter has challenged convention to elevate the diagnostic laboratory’s role in improving patient health for more than 80 years.” Source: RevenueBase Database · checked Sep 20, 2026
6	Waters Corporation	Indirect evidence	Milford, MA, United StatesHQ checked Sep 20, 2026	10001+	8,189 contacts →
	Indirect evidence “Waters Corporation (NYSE: WAT) is a global leader in life sciences and diagnostics, dedicated to accelerating the benefits of pioneering science through analytical technologies…” Source: RevenueBase Database · checked Sep 20, 2026
7	Bio-Rad Laboratories	Indirect evidence	Hercules, CA, United StatesHQ checked Sep 20, 2026	5,001-10,000	8,149 contacts →
	Indirect evidence “Bio-Rad provides the healthcare industry with innovative and useful products that help life science researchers accelerate the discovery process and medical diagnostic labs obtain…” Source: RevenueBase Database · checked Sep 20, 2026
8	IDEXX	Indirect evidence	Westbrook, ME, United StatesHQ checked Sep 20, 2026	10001+	6,962 contacts →
	Indirect evidence “people, one global focus - enhancing the health and well-being of pets, people, and livestock We are passionate about what we do at IDEXX – and why wouldn’t we be?” Source: RevenueBase Database · checked Sep 20, 2026
9	Revvity	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	10001+	2,938 contacts →
	Indirect evidence “At Revvity, “impossible” is inspiration, and ""can't be done"" is a call to action.” Source: RevenueBase Database · checked Sep 20, 2026
10	Arup Laboratories	Partial evidence	Salt Lake City, UT, United StatesHQ checked Sep 20, 2026	1,001-5,000	2,768 contacts →
	Partial evidence “ARUP Laboratories is a national clinical and anatomic pathology reference laboratory and a worldwide leader in innovative laboratory research and development.” Source: RevenueBase Database · checked Sep 20, 2026
11	Myriad Genetics	Partial evidence	Salt Lake City, UT, United StatesHQ checked Sep 20, 2026	1,001-5,000	2,718 contacts →
	Partial evidence “Myriad Genetics is a leading molecular diagnostic testing and precision medicine company dedicated to advancing health and well-being for all.” Source: RevenueBase Database · checked Sep 20, 2026
12	Pace Analytical Services	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 20, 2026	1,001-5,000	2,228 contacts →
	Indirect evidence “Pace® Science and Technology Company makes the world a safer, healthier place.” Source: RevenueBase Database · checked Sep 20, 2026
13	Neogenomics Laboratories	Indirect evidence	Fort Myers, FL, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,678 contacts →
	Indirect evidence “Our vision: A world where every cancer treatment decision is as personal as the patient.” Source: RevenueBase Database · checked Sep 20, 2026
14	Eurofins Lancaster Laboratories	Partial evidence	Lancaster, PA, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,638 contacts →
	Partial evidence “Eurofins Lancaster Laboratories is one of the largest commercial contract laboratories in the world providing comprehensive laboratory services in the pharmaceutical…” Source: RevenueBase Database · checked Sep 20, 2026
15	Bioreference	Strong evidence	Elmwood Park, NJ, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,610 contacts →
	Strong evidence “For more than four decades, BioReference has built a legacy based on scientific excellence, innovation and world-class service in laboratory testing solutions.” Source: RevenueBase Database · checked Sep 20, 2026
16	Clinical Pathology Laboratories	Partial evidence	Austin, TX, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,528 contacts →
	Partial evidence “Clinical Pathology Laboratories (CPL) is a medically-led company dating back to 1948.” Source: RevenueBase Database · checked Sep 20, 2026
17	Examone, A Quest Diagnostics Company	Partial evidence	Lenexa, KS, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,369 contacts →
	Partial evidence “ExamOne has provided a robust portfolio of laboratory, paramedical and data solutions since 1972, giving it a great deal of understanding about the needs of life insurance and…” Source: RevenueBase Database · checked Sep 20, 2026
18	Q Solutions	Partial evidence	Durham, NC, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,291 contacts →
	Partial evidence “Q² Solutions is now IQVIA Laboratories.” Source: RevenueBase Database · checked Sep 20, 2026
19	Sonora Quest Laboratories Laboratory Sciences Of Arizona	Partial evidence	Phoenix, AZ, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,222 contacts →
	Partial evidence “Sonora Quest Laboratories, a subsidiary of Laboratory Sciences of Arizona, is an Arizona-based joint venture between Banner Health and Quest Diagnostics (NYSE: DGX) that makes up…” Source: RevenueBase Database · checked Sep 20, 2026
20	Genscript	Indirect evidence	Piscataway, NJ, United StatesHQ checked Sep 20, 2026	5,001-10,000	1,194 contacts →
	Indirect evidence “GenScript Life Science Group is a part of GenScript Biotech Corporation.” Source: RevenueBase Database · checked Sep 20, 2026
21	Pathgroup	Indirect evidence	Brentwood, TN, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,098 contacts →
	Indirect evidence “Founded in 1965, PathGroup is a premier provider of anatomic, clinical and molecular pathology services, as well as one of the largest providers of women’s health services in the…” Source: RevenueBase Database · checked Sep 20, 2026
22	Inotiv	Indirect evidence	West Lafayette, IN, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,015 contacts →
	Indirect evidence “WHERE INSIGHTS LEAD TO ANSWERS Expect More In choosing a partner for discovery, development and research models, expect more: more attention, more insight, and a superlative…” Source: RevenueBase Database · checked Sep 20, 2026
23	Ambry Genetics	Indirect evidence	Aliso Viejo, CA, United StatesHQ checked Sep 20, 2026	501-1,000	957 contacts →
	Indirect evidence “Ambry Genetics, a Tempus company, translates scientific research into clinically actionable test results based upon a deep understanding of the human genome and the biology behind…” Source: RevenueBase Database · checked Sep 20, 2026
24	Bioagilytix	Indirect evidence	Durham, NC, United StatesHQ checked Sep 20, 2026	1,001-5,000	915 contacts →
	Indirect evidence “BioAgilytix is a leading global contract research organization focused on supporting pharmaceutical and biotech partners in all phases of drug development.” Source: RevenueBase Database · checked Sep 20, 2026
25	Luminex	Indirect evidence	Austin, TX, United StatesHQ checked Sep 20, 2026	501-1,000	837 contacts →
	Indirect evidence “At Luminex, our mission is to empower labs to obtain reliable, timely, and actionable answers, ultimately advancing health.” Source: RevenueBase Database · checked Sep 20, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: laboratory testing companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names laboratory testing companies.
Partial evidence: Its own public description names part of laboratory testing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name laboratory testing companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 2,505 laboratory testing companies based in the United States

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Laboratory testing companies based in the United States at a glance

As of Sep 20, 2026

32.7%Verified-email coverage

128.1Average contacts per company

11-50Median size (employees)

2.1%Largest-city concentration · Houston

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

885

11-50

930

51-200

445

201-500

119

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 2,505 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among laboratory testing companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “laboratory testing companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names laboratory testing companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among laboratory testing companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 104,958 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Laboratory testing companies by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names laboratory testing companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many laboratory testing companies are there based in the United States?

RevenueBase identified 2,505 laboratory testing companies headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Thermo Fisher Scientific, headquartered in Waltham, tops this list with the largest team on record.

Which city has the most laboratory testing companies?

Houston leads with 53 headquartered companies, followed by San Diego (41) and Irvine (35).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 104,958 verified decision-maker contacts tracked across these 2,505 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.