Women's STI Screening Guide: What Tests by Age

A women's STI screening guide tells you which tests to expect by age and risk. If you're a sexually active woman under 25, plan on yearly chlamydia and gonorrhea screening. Everyone aged 15 to 65 should be tested for HIV at least once. Older women with new or multiple partners need testing too, even without symptoms.

The single most useful idea here: screening is testing when you feel fine. Most chlamydia and gonorrhea infections in women cause no noticeable symptoms, so waiting for a sign means missing infections that can quietly scar the fallopian tubes. How often you test is driven by your risk — new partners, a partner who tested positive, inconsistent condom use — not by whether anything feels wrong USPSTF. This guide focuses on what's automatic at the visit versus what you have to specifically ask for.

What gets screened by age and risk

The recommendations below come from the USPSTF and CDC. The key distinction worth understanding is that some tests are routine at certain ages, while others only happen if you flag your risk or ask directly. Clinicians don't always volunteer the full panel, so knowing what applies to you is how you avoid gaps.

USPSTF recommends screening all sexually active women under 25 for chlamydia and gonorrhea every year, and older women who have new or multiple partners or other risk factors. For HIV, USPSTF recommends everyone aged 15 to 65 be tested at least once, with younger or older people at increased risk tested as well USPSTF HIV. Anyone who is pregnant is screened for HIV and syphilis — and hepatitis B — because treating these during pregnancy protects the baby USPSTF, pregnancy.

If you have sex with partners of more than one gender, or your anatomy and partners involve oral or anal sex, the same logic about missed sites applies to you. Throat and rectal infections won't show up on a urine test. The same point CDC makes for men who have sex with men — that single-site testing misses infections — is why you should name those exposures so the right swabs get ordered CDC. For broader guidance across identities, see our transgender sexual health & sti screening guide.

How the test works

Most women's STI screening uses one of three sample types, and none of them is the painful exam many people picture. For chlamydia and gonorrhea, the standard is a nucleic acid amplification test (NAAT), which detects the bacteria's genetic material. It's highly sensitive, so it can find an infection from a small sample. The sample is usually a self-collected vaginal swab — you insert a small swab yourself in a private bathroom — or a urine sample. The vaginal swab tends to catch slightly more infections than urine in women, so it's often preferred.

HIV and syphilis screening use a blood sample, either a standard draw or a fingerstick. Modern HIV tests look for both antibodies and the p24 antigen, which lets them detect infection earlier than older antibody-only tests. Syphilis screening uses a blood test that's confirmed with a second blood test if the first is reactive.

If oral or anal sex is part of your life, ask specifically for throat and rectal swabs — these are quick swabs of those sites, and they're the only way to catch infections living there. A routine order rarely includes them unless you bring it up.

When to test after exposure

Each infection has a window period — the gap between exposure and when a test can reliably detect it. Test too early and you can get a false negative even though you're infected. Chlamydia and gonorrhea become detectable within a couple of weeks of exposure. HIV and syphilis take longer, since the test relies on your body producing detectable markers.

If you've had a specific exposure you're worried about, don't guess at the timing. Our breakdown of the exact windows by infection is here: when to test after exposure. For routine screening when you feel fine and have no specific scare, you don't need to time anything — you test on the schedule your risk calls for.

Where to get tested and what it costs

You have more options than your regular doctor's office. Primary care, OB-GYN visits, Planned Parenthood and local health departments, urgent care, and mail-in home test kits all offer STI screening. Many of the recommended screenings are covered as preventive care, which means no out-of-pocket cost on most insurance plans. Public health clinics often offer free or sliding-scale testing if you're uninsured.

A practical move is to tie testing to something you already do: a new relationship, your annual checkup, or starting PrEP. You can also order an at-home kit and collect your own sample. To start, you can get tested, and if you want to weigh price, turnaround, and which infections each panel covers, compare testing providers.

Reading your results and how accurate they are

NAAT screening for chlamydia and gonorrhea is very accurate, which is part of why self-collected swabs work so well. A negative result on a properly timed test is reliable. A reactive HIV or syphilis screen is a first step, not a final answer — these are designed to be sensitive, so a reactive result is always confirmed with a second, more specific test before it's considered a diagnosis. Don't panic at an initial reactive result until the confirmatory test is back.

The biggest accuracy pitfall isn't the lab — it's testing inside the window period, which can produce a false negative. The second pitfall is testing only one site. If you negative on a urine test but the infection is in your throat or rectum, you'll get a clean result that misses the real infection. Match the sample to your actual exposures.

If a result is positive

Most bacterial STIs — chlamydia, gonorrhea, syphilis — are curable, and a positive result means starting the right treatment and notifying recent partners so they can be treated too. For HIV, starting treatment early protects your own health and dramatically lowers the chance of passing it on; see how earlier hiv treatment can help prevention. Don't have sex until you and your partner have finished treatment and your clinician clears you.

When to see a clinician

Book a visit, rather than relying on routine screening alone, if you notice any of the following — these can signal an infection that's progressed and needs prompt evaluation:

• Unusual vaginal discharge, a new odor, or itching that doesn't resolve.
• Pain or burning when you urinate, or pelvic or lower-abdominal pain — pelvic pain can signal pelvic inflammatory disease (infection spreading to the uterus and tubes, which can threaten fertility).
• Bleeding between periods or after sex.
• Any sore, ulcer, or bump on the genitals.
• A partner tells you they tested positive — get evaluated even if you feel fine.
• You're pregnant or planning pregnancy and haven't been screened.