STI Testing: Where and How Often

Getting tested for STIs is one of the least dramatic things you can do for your sex life, and one of the most useful. Most infections cause no symptoms at all, so the only way to know your status is to test on a schedule. This guide covers how often to go, what to ask for, where to find a clinic, and how soon after a risky encounter a test will actually pick something up.

How often should you test?

Frequency depends on how many partners you have and what kind of sex you're having. The US Centers for Disease Control and Prevention recommends that gay and bisexual men, and other men who have sex with men, screen for HIV and bacterial STIs at least once a year. If you have multiple or anonymous partners, move that up to every three to six months.

• Multiple or new partners: every 3 to 6 months
• On PrEP: every 3 months, since testing is built into the prescription follow-up
• On doxy PEP: every 3 to 6 months at each site of exposure
• One regular partner, both tested: at least once a year
• After a condom break or known exposure: as soon as it makes sense, then a follow-up test once the window period has passed

If you can't remember the last time you went, that's usually a sign it's time.

What a full screen should include

A proper screen looks at more than HIV. Ask for the full panel:

• HIV (blood draw or a rapid finger-prick test)
• Syphilis (blood test)
• Gonorrhea (urine, plus throat and rectal swabs)
• Chlamydia (urine, plus throat and rectal swabs)
• Hepatitis B and C (blood test)

The single most overlooked detail here is the swabbing. If you have oral or anal sex, ask for three-site testing for gonorrhea and chlamydia, meaning throat, genitals, and rectum. A urine-only test misses a large share of throat and rectal infections, and those are often the ones with no symptoms at all. Many clinics won't swab every site unless you tell them what kind of sex you have, so be specific. It's their job to hear it without flinching.

Timing matters: the window period

Testing the morning after a risky night feels responsible, but it can give you false reassurance. Every infection has a window period, the gap between exposure and the point a test can reliably detect it.

For HIV, the standard fourth-generation antigen/antibody lab test detects most infections between 18 and 45 days after exposure, with about 99% of cases picked up by day 44. A negative result at six weeks is considered highly reliable. RNA (NAT) testing can flag HIV earlier, roughly 10 to 33 days out, but it costs more and isn't used for routine screening. Bacterial infections like gonorrhea and chlamydia show up faster, often within a week or two.

The practical takeaway: if you test right after a possible exposure and it comes back negative, book a follow-up a few weeks later to confirm. One early test on its own doesn't close the question.

Where to get tested

You have more options than you might think, and many cost nothing.

• Sexual health clinics: often free or low-cost, and staff there test for STIs all day, so there's no awkwardness
• LGBTQ+ health centers: built around queer patients, frequently the most clued-up on three-site testing and PrEP
• Your regular doctor: fine for routine screens, though you may need to ask directly for the full panel
• Planned Parenthood (US): sliding-scale fees and walk-in options in many locations
• Home testing kits: useful for HIV and some bacterial STIs, handy when a clinic visit is hard to fit in

If you're choosing a long-term provider, it helps to pick one who already gets queer sexual health. Our guide to finding LGBTQ+-friendly healthcare providers walks through how to spot a good fit and what to ask on a first visit.

Prevention works alongside testing

Testing tells you where you stand. Prevention changes the odds going forward. PrEP cuts the risk of getting HIV through sex to near zero when taken as prescribed, and the quarterly check-ins double as a built-in testing rhythm. Our country-by-country PrEP access guide covers how to get it where you live.

For bacterial STIs, the CDC's 2024 guidance backs doxy PEP: a 200 mg dose of doxycycline taken within 72 hours of condomless sex, shown in large trials to cut syphilis and chlamydia by more than 70% and gonorrhea by around half. It's aimed at people who've had a bacterial STI in the past year, so it's worth raising with a provider who knows your history rather than self-prescribing.

Make it routine, not a reaction

The people who stay on top of their sexual health rarely treat testing as an emergency. They fold it into the calendar the way they would a dentist visit. If you're heading somewhere new, it's also worth knowing how local healthcare and laws work before you arrive. Our notes on traveling while gay and on building a support network through finding community when traveling can point you to clinics and people who have your back on the road.