Company lists · Data refreshed September 2026

Top 25 Diagnostic companies based in the United States

Name: Diagnostic 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 19, 2026 3,243 companies tracked

RevenueBase identified 3,243 diagnostic companies headquartered in the United States as of September 2026 and tracks 392,132 professional contacts across them, including 139,351 with verified work emails. San Diego is the largest hub.

This list covers diagnostic 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 19, 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 19, 2026 86% judged on-target in blind review

3,243Companies

392,132Contacts tracked

139,351Verified emails

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The 25 largest diagnostic companies based in the United States

Ranked by team size

Top 25 of 3,243 diagnostic companies based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to diagnostic 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 19, 2026	10001+	70,907 contacts →
	Indirect evidence “About Thermo Fisher Scientific Thermo Fisher Scientific Inc.” Source: RevenueBase Database · checked Sep 19, 2026
2	Agilent Technologies	Indirect evidence	Santa Clara, CA, United StatesHQ checked Sep 19, 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 19, 2026
3	Labcorp	Indirect evidence	Burlington, NC, United StatesHQ checked Sep 19, 2026	10001+	38,427 contacts →
	Indirect evidence “Clear and confident health care decisions begin with questions.” Source: RevenueBase Database · checked Sep 19, 2026
4	Quest Diagnostics	Strong evidence	Secaucus, NJ, United StatesHQ checked Sep 19, 2026	10001+	27,884 contacts →
	Strong evidence “Quest Diagnostics (NYSE: DGX) empowers people to take action to improve health outcomes.” Source: RevenueBase Database · checked Sep 19, 2026
5	Beckman Coulter Diagnostics	Strong evidence	Brea, CA, United StatesHQ checked Sep 19, 2026	10001+	10,069 contacts →
	Strong 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 19, 2026
6	Illumina	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 19, 2026	5,001-10,000	8,987 contacts →
	Indirect evidence “At Illumina, our goal is to apply innovative technologies and revolutionary assays to the analysis of genetic variation and function, making studies possible that were not even…” Source: RevenueBase Database · checked Sep 19, 2026
7	Waters Corporation	Strong evidence	Milford, MA, United StatesHQ checked Sep 19, 2026	10001+	8,189 contacts →
	Strong 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 19, 2026
8	Bio-Rad Laboratories	Strong evidence	Hercules, CA, United StatesHQ checked Sep 19, 2026	5,001-10,000	8,149 contacts →
	Strong 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 19, 2026
9	IDEXX	Indirect evidence	Westbrook, ME, United StatesHQ checked Sep 19, 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 19, 2026
10	Exact Sciences	Indirect evidence	Madison, WI, United StatesHQ checked Sep 19, 2026	5,001-10,000	5,907 contacts →
	Indirect evidence “Exact Sciences is now @Abbott.” Source: RevenueBase Database · checked Sep 19, 2026
11	Natera	Indirect evidence	Austin, TX, United StatesHQ checked Sep 19, 2026	5,001-10,000	5,354 contacts →
	Indirect evidence “Natera™ is a global leader in cell-free DNA and precision medicine, dedicated to oncology, women’s health, and organ health.” Source: RevenueBase Database · checked Sep 19, 2026
12	Cepheid	Strong evidence	Sunnyvale, CA, United StatesHQ checked Sep 19, 2026	5,001-10,000	4,445 contacts →
	Strong evidence “Cepheid is dedicated to improving healthcare by pioneering molecular diagnostics that combine speed, accuracy, and flexibility.” Source: RevenueBase Database · checked Sep 19, 2026
13	Guardant Health	Indirect evidence	Palo Alto, CA, United StatesHQ checked Sep 19, 2026	1,001-5,000	3,321 contacts →
	Indirect evidence “Guardant Health is a leading precision medicine company focused on guarding wellness and giving every person more time free from cancer.” Source: RevenueBase Database · checked Sep 19, 2026
14	Radnet	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 19, 2026	10001+	3,126 contacts →
	Indirect evidence “RadNet, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
15	Merit Medical Systems, INC	Indirect evidence	South Jordan, UT, United StatesHQ checked Sep 19, 2026	5,001-10,000	3,033 contacts →
	Indirect evidence “As a global healthcare company, we understand customer needs and innovate and deliver medical solutions that transform patient care.” Source: RevenueBase Database · checked Sep 19, 2026
16	Danaher	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	10001+	2,941 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
17	Revvity	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 19, 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 19, 2026
18	Ortho Clinical Diagnostics	Indirect evidence	Raritan, NJ, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,730 contacts →
	Indirect evidence “QuidelOrtho develops and manufactures intelligent solutions that are transforming data into understanding and action for more people in more places every day, helping spot trends…” Source: RevenueBase Database · checked Sep 19, 2026
19	Myriad Genetics	Strong evidence	Salt Lake City, UT, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,718 contacts →
	Strong 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 19, 2026
20	Beckman Coulter Life Sciences	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,121 contacts →
	Indirect evidence “Time is the most critical facet in the laboratory today: time to get life-saving therapies to patients faster; reclaiming time by automating tedious manual workflows; and saving…” Source: RevenueBase Database · checked Sep 19, 2026
21	Bio-Techne	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,976 contacts →
	Indirect evidence “Bio-Techne is a global life sciences company that empowers scientific discovery and advances human health.” Source: RevenueBase Database · checked Sep 19, 2026
22	Curium Pharma	Strong evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,959 contacts →
	Strong evidence “Curium is the global leader in nuclear medicine, providing life-changing diagnostics and treatment to patients all over the world.” Source: RevenueBase Database · checked Sep 19, 2026
23	Werfen North America	Indirect evidence	Bedford, MA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,908 contacts →
	Indirect evidence “Werfen is a growing, family-owned, innovative company founded in 1966 in Barcelona, Spain.” Source: RevenueBase Database · checked Sep 19, 2026
24	Antech Diagnostics	Strong evidence	Fountain Valley, CA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,884 contacts →
	Strong evidence “Smarter Diagnostics.” Source: RevenueBase Database · checked Sep 19, 2026
25	Foundation Medicine	Strong evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,747 contacts →
	Strong evidence “Foundation Medicine is a global, patient-focused precision medicine company delivering high-quality, transformative diagnostic solutions in cancer and other diseases.” Source: RevenueBase Database · checked Sep 19, 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: diagnostic 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 diagnostic companies.
Partial evidence: Its own public description names part of diagnostic companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name diagnostic 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 3,243 diagnostic companies based in the United States

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Diagnostic companies based in the United States at a glance

As of Sep 19, 2026

35.5%Verified-email coverage

120.9Average contacts per company

11-50Median size (employees)

2.5%Largest-city concentration · San Diego

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

1,162

11-50

1,155

51-200

586

201-500

151

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 3,243 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 diagnostic 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 “diagnostic 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 diagnostic 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 diagnostic 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, 139,351 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 19, 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.

Diagnostic 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 diagnostic 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 diagnostic companies are there based in the United States?

RevenueBase identified 3,243 diagnostic 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 diagnostic companies?

San Diego leads with 82 headquartered companies, followed by Houston (72) and New York (64).

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 139,351 verified decision-maker contacts tracked across these 3,243 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 19, 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.