Clinical & Reference Laboratories in Harris County, TX

We list 110 clinical laboratories serving Harris County, TX: 88 based there and 22 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 Harris County, TX are Accel Diagnostic Laboratories, Access Dx Laboratory LLC, Adg Houston Path PLLC, Advance Testing Laboratory, LLC and Alaine Diagnostic, LLC. 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: Accel Diagnostic Laboratories (Centers for Medicare & Medicaid Services), Access Dx Laboratory LLC (Centers for Medicare & Medicaid Services), Adg Houston Path PLLC (Centers for Medicare & Medicaid Services), Advance Testing Laboratory, LLC (Centers for Medicare & Medicaid Services) and Alaine Diagnostic, LLC (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.