Harris County Institute of Forensic Sciences

Houston carries 190 laboratory testing listings, too many to scroll through one by one. Narrowing by zip code first speeds things up. Zip 77054 has 9 listings, the most of any area, with 77008 next at 6 and smaller clusters in 77074, 77014, 77065, 77081, and 77092. Start near your own zip and the list shrinks fast.

Most entries here include contact info: 188 show a phone number and 160 link to a website, so you can check services before calling. None of these Houston listings are marked verified. Paid placements carry a Sponsored label, and this category has no such tag right now, so what you're looking at is a plain, unranked list. If you run a lab and the number or site link is wrong, you can claim the listing and correct it, so the next Houston patient reaches you instead of a dead end. Pick two or three near you and call.