Clinical & Reference Laboratories in Williamson County, TX

We list 50 clinical laboratories serving Williamson County, TX: 10 based there and 40 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 Williamson County, TX are Brushy Creek Family Hospital, Central Tox Doing Business As Semper Fi Labs, Endless Health Inc, Impact Health Labs LLC and Novion Diagnostics. 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: Brushy Creek Family Hospital (Centers for Medicare & Medicaid Services), Central Tox Doing Business As Semper Fi Labs (Centers for Medicare & Medicaid Services), Endless Health Inc (Centers for Medicare & Medicaid Services), Impact Health Labs LLC (Centers for Medicare & Medicaid Services) and Novion Diagnostics (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.