Clinical & Reference Laboratories in King County, WA

We list 75 clinical laboratories serving King County, WA: 45 based there and 30 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 King County, WA are Actx Inc, Adaptive Biotechnologies, Altpep Corporation, Berries Health And Genetics Laboratory and Cellnetix Labs. 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: Actx Inc (Centers for Medicare & Medicaid Services), Adaptive Biotechnologies (Centers for Medicare & Medicaid Services), Altpep Corporation (Centers for Medicare & Medicaid Services), Berries Health And Genetics Laboratory (Centers for Medicare & Medicaid Services) and Cellnetix Labs (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.