Clinical & Reference Laboratories in Orange County, CA

We list 391 clinical laboratories serving Orange County, CA: 119 based there and 272 serving it from nearby. 10 of the top 10 match an active federal or state record, checked on 2026-11-04.

The top-ranked clinical laboratories serving Orange County, CA are Advanced Biomedical, Inc, Agendia Inc, Altasciences Los Angeles, Altera Laboratory Services, LLC and Ambry Genetics. The full ranked list, with the official records each provider matched, is on this page.

10 of the top 10 match an active official record: Advanced Biomedical, Inc (Centers for Medicare & Medicaid Services), Agendia Inc (Centers for Medicare & Medicaid Services), Altasciences Los Angeles (Centers for Medicare & Medicaid Services), Altera Laboratory Services, LLC (Centers for Medicare & Medicaid Services) and Ambry Genetics (Centers for Medicare & Medicaid Services), and 5 more on this page. Each badge links to the official record it matched.

By our published methodology: verified registrations, documented capabilities, years registered and responsiveness. Sponsored placements are shown separately and never affect rank.

"Verified" means we matched the provider to an active official record on the date shown; each badge links to that record. The absence of a badge only means we have not verified that item.

CLIA certificates are issued under federal law for laboratories testing human specimens. A certificate of compliance or accreditation covers moderate and high complexity testing; a certificate of waiver covers only simple waived tests.