Company lists · Data refreshed September 2026

Top 25 Diagnostic companies worldwide

Name: Diagnostic companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 18,879 companies tracked

RevenueBase identified 18,879 diagnostic companies worldwide as of September 2026 and tracks 985,529 professional contacts across them, including 296,358 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers diagnostic companies worldwide, 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. Country and city lists for diagnostic companies follow the table.

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

18,879Companies

985,529Contacts tracked

296,358Verified emails

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The 25 largest diagnostic companies worldwide

Ranked by team size

Top 25 of 18,879 diagnostic companies worldwide, 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	ROCHE	Strong evidence	Switzerland 🇨🇭, MexicoHQ checked Sep 19, 2026	10001+	63,392 contacts →
	Strong evidence “Roche is a global pioneer in pharmaceuticals and diagnostics focused on advancing science to improve people’s lives.” Source: RevenueBase Database · checked Sep 19, 2026
3	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
4	Siemens Healthineers	Indirect evidence	Forchheim, GermanyHQ checked Sep 19, 2026	10001+	44,956 contacts →
	Indirect evidence “Siemens Healthineers is a leading medtech company with over 125 years of experience.” Source: RevenueBase Database · checked Sep 19, 2026
5	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
6	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
7	DASA	Indirect evidence	Sao Paulo, BrazilHQ checked Sep 19, 2026	10001+	19,606 contacts →
	Indirect evidence “A Dasa é uma das maiores empresas de saúde do mundo, líder em medicina diagnóstica no Brasil.” Source: RevenueBase Database · checked Sep 19, 2026
8	Biomérieux	Strong evidence	Marcy-l'étoile, United KingdomHQ checked Sep 19, 2026	10001+	11,986 contacts →
	Strong evidence “A family-owned company, bioMérieux has grown to become a world leader in the field of in vitro diagnostics.” Source: RevenueBase Database · checked Sep 19, 2026
9	Eurofins	Indirect evidence	LuxembourgHQ checked Sep 19, 2026	10001+	11,653 contacts →
	Indirect evidence “Since 1987, Eurofins has grown from one laboratory in Nantes, France to over staff across a network of independent companies in 59 countries, operating over 950 laboratories.” Source: RevenueBase Database · checked Sep 19, 2026
10	Grupo Fleury	Indirect evidence	São Paulo, BrazilHQ checked Sep 19, 2026	10001+	10,468 contacts →
	Indirect evidence “O Grupo Fleury é reconhecido como uma referência de qualidade em medicina diagnóstica no país, com soluções completas, coordenação de cuidado centrada no indivíduo, capacidade de…” Source: RevenueBase Database · checked Sep 19, 2026
11	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
12	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
13	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
14	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
15	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
16	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
17	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
18	Dedalus	Strong evidence	Milan, ItalyHQ checked Sep 19, 2026	5,001-10,000	5,339 contacts →
	Strong evidence “Dedalus Group is the leading healthcare and diagnostic software provider in Europe, supporting globally the digital transformation of 7500 Healthcare Organisations and 5700 Labs…” Source: RevenueBase Database · checked Sep 19, 2026
19	Menarini Group	Strong evidence	Firenze, ItalyHQ checked Sep 19, 2026	10001+	4,897 contacts →
	Strong evidence “The Menarini Group is a leading international pharmaceutical and diagnostics company, with 140 years of history, present in 140 countries worldwide, with a turnover of 4.88…” Source: RevenueBase Database · checked Sep 19, 2026
20	DR LAL Pathlabs	Strong evidence	Gurgaon, IndiaHQ checked Sep 19, 2026	1,001-5,000	4,756 contacts →
	Strong evidence “Established in 1949, Dr Lal PathLabs today is the largest and most respected diagnostic service provider in the country.” Source: RevenueBase Database · checked Sep 19, 2026
21	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
22	Lancet Laboratories	Strong evidence	Johannesburg, South AfricaHQ checked Sep 19, 2026	5,001-10,000	4,365 contacts →
	Strong evidence “Lancet Laboratories SA is one of the leading pathology laboratories operating throughout South Africa, providing vital diagnostic and monitoring pathology services in the 9…” Source: RevenueBase Database · checked Sep 19, 2026
23	Quidelortho	Indirect evidence	United StatesHQ checked Sep 19, 2026	5,001-10,000	3,581 contacts →
	Indirect evidence “Bringing precision and passion in everything we do QuidelOrtho stands at the forefront of testing, tracking and disease analysis of health conditions ranging from HIV and…” Source: RevenueBase Database · checked Sep 19, 2026
24	Lifelabs Medical Laboratory Services	Strong evidence	Toronto, ON, CanadaHQ checked Sep 19, 2026	5,001-10,000	3,469 contacts →
	Strong evidence “LifeLabs is Canada’s leading provider of laboratory diagnostic information and digital health connectivity systems, enabling patients and healthcare practitioners to diagnose…” Source: RevenueBase Database · checked Sep 19, 2026
25	Grupo Sabin	Indirect evidence	Brasilia, BrazilHQ checked Sep 19, 2026	5,001-10,000	3,343 contacts →
	Indirect evidence “O Laboratório Sabin é o maior da região Centro-Oeste, com unidades no D.F, Goiás e Bahia.” 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 18,879 diagnostic companies worldwide

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Diagnostic companies worldwide at a glance

As of Sep 19, 2026

30.1%Verified-email coverage

52.2Average contacts per company

11-50Median size (employees)

1.3%Largest-city concentration · Sao Paulo

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

6,582

11-50

6,780

51-200

3,270

201-500

1,148

501-1,000

443

1,001-5,000

411

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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.
Coverage: Every country. Country and city lists for diagnostic companies are linked below.
What qualifies: Companies worldwide 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.
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, 296,358 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 location

78 lists · largest first

Every Diagnostic companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 worldwide?

RevenueBase identified 18,879 diagnostic companies worldwide 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 country has the most diagnostic companies?

The United States leads with 3,243 companies, followed by Brazil (2,208) and India (2,010). Every diagnostic companies list by country and city is linked on this page.

Which city has the most diagnostic companies?

Sao Paulo leads with 239 headquartered companies, followed by New Delhi (176) and London (141).

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 296,358 verified decision-maker contacts tracked across these 18,879 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.