Pharmacology Research Institute

Los Angeles has 136 laboratory testing listings on this page, and a handful of ZIP codes carry more weight than the rest. Codes like 90025, 90045, 90048, 90064, 91356, and 91403 each hold 3 entries, so if you're comparing options nearby, start there rather than scrolling the whole list. Call two or three in your ZIP and ask about turnaround times and sample requirements before you commit to one.

Most entries here include a phone number, with 135 of the 136 listings showing one, though fewer carry a website. Nothing on this page is labeled Sponsored, since paid placements haven't rolled out for this category, so every lab sits in the same plain format without a boosted slot pulling your eye first. If you run one of these labs and notice your own listing missing contact details, you can claim it and add what's missing, since an empty field can push a caller toward the next name on the page instead of yours.