Clinical & Reference Laboratories in West Covina, CA

We list 293 clinical laboratories serving West Covina, CA: 0 based there and 293 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 West Covina, CA are Accurate Clinical Laboratory Corp, L&l Diagnostics, LLC, City Of Hope Histocompatibility (hla), Citrus Pathology Medical Group and Avrok Biosciences, Inc. 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: Accurate Clinical Laboratory Corp (Centers for Medicare & Medicaid Services), L&l Diagnostics, LLC (Centers for Medicare & Medicaid Services), City Of Hope Histocompatibility (hla) (Centers for Medicare & Medicaid Services), Citrus Pathology Medical Group (Centers for Medicare & Medicaid Services) and Avrok Biosciences, Inc (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.