Most sexually active adults should be tested for at least four STIs: chlamydia, gonorrhea, syphilis, and HIV. Beyond that core list, your age, sex, sexual partners, and pregnancy status determine whether you also need screening for hepatitis B, hepatitis C, or other infections. There’s no single “full panel” that every clinic runs automatically, so knowing what to ask for puts you in control of your own screening.
The Tests Nearly Everyone Needs
Two screenings are recommended for virtually all adults in the U.S. regardless of sexual history. Every person between ages 13 and 64 should get tested for HIV at least once in their lifetime. And every adult aged 18 to 79 should be screened for hepatitis C at least once. These are one-and-done tests for most people, though anyone with ongoing risk factors (like multiple partners or injection drug use) should repeat them periodically.
If you’ve never had either of these tests, or you aren’t sure, they’re a reasonable starting point no matter what brought you to this article.
Screening for Women Under 25
Chlamydia and gonorrhea are the big two for younger women. All sexually active women under 25 should be screened for both infections at least once a year. Women 25 and older need annual testing only if they have risk factors like a new partner, multiple partners, or a partner with a known STI. These infections often cause zero symptoms in women but can silently damage the reproductive tract and lead to infertility if left untreated.
Testing is straightforward: a urine sample or a vaginal swab. No blood draw required.
Screening for Men Who Have Sex With Men
Guidelines call for more frequent and more comprehensive screening for men who have sex with men (MSM), reflecting higher transmission rates for several infections in this group. At minimum, sexually active MSM should be tested annually for all of the following:
- Chlamydia at every site of sexual contact (urethra, rectum), regardless of condom use
- Gonorrhea at every site of contact (urethra, rectum, throat)
- Syphilis via blood test
- HIV if status is unknown or negative and either partner has had other sexual partners since the last test
- Hepatitis B if vaccination status or prior infection is unknown
If you’re on PrEP, living with HIV, or you or your partners have multiple sexual partners, the recommended frequency jumps to every 3 to 6 months for chlamydia, gonorrhea, syphilis, and HIV. The “at every site of contact” detail matters: a standard urine test for gonorrhea will miss a throat or rectal infection entirely, so make sure your provider knows about oral and anal sex so they can swab the right locations.
Screening During Pregnancy
Pregnancy triggers the most thorough round of STI testing most people will ever receive. At the first prenatal visit, all pregnant women should be tested for HIV, syphilis, and hepatitis B. Pregnant women under 25 (or older women with risk factors) should also be tested for chlamydia and gonorrhea. Hepatitis C screening is now recommended during every pregnancy.
Because of a sharp rise in congenital syphilis cases, the American College of Obstetricians and Gynecologists now recommends universal syphilis rescreening in the third trimester and again at delivery, rather than only retesting women considered high-risk. Women at continued risk for chlamydia or gonorrhea should also be retested in the third trimester. These infections can cause serious complications for the baby, including preterm birth, low birth weight, and life-threatening infections passed during delivery.
What About Herpes Testing?
This one surprises many people. Routine blood testing for herpes is not recommended for anyone without symptoms. The U.S. Preventive Services Task Force actively recommends against it, giving it their lowest grade. The reason is practical: the widely available blood tests for herpes produce a high rate of false positives, and the more reliable confirmatory test (called a Western blot) isn’t easy to get. A false-positive herpes diagnosis carries real emotional and social harm, and for someone with no symptoms, the benefit of knowing is unclear since there’s no strong rationale for starting antiviral treatment.
If you have actual sores, blisters, or a history of genital outbreaks, that’s a different situation. A provider can swab an active lesion directly, which is far more accurate than a blood test. But if you’re asymptomatic and simply want a “test for everything,” herpes is the one most clinicians will leave off the list on purpose.
How Each Test Works
Knowing what to expect can take some anxiety out of the visit. STI tests fall into three categories:
- Blood draw: Used for HIV, syphilis, hepatitis B, and hepatitis C. A small sample from a vein in your arm. HIV can also be screened with a rapid oral swab in some settings.
- Urine sample: Used for chlamydia, gonorrhea, and trichomoniasis. You urinate into a cup. No swab, no discomfort.
- Swab: Used for chlamydia, gonorrhea, and HPV, and for herpes when active sores are present. Samples can be taken from the vagina, cervix, penis, urethra, rectum, or throat depending on the infection and site of exposure. Vaginal swabs can often be self-collected.
A “full” screening visit typically combines a blood draw with either a urine test or swabs, so you may be providing two or three sample types in a single appointment.
Window Periods: When to Get Tested
Testing too soon after a potential exposure can produce a false negative because the infection hasn’t built up enough to detect. Each STI has its own window period.
Chlamydia and gonorrhea can usually be detected about one week after exposure, with two weeks catching nearly all cases. Syphilis takes longer: a blood test picks up most infections by one month, but waiting three months catches almost everyone. HIV timing depends on the test type. A newer blood test that looks for both the virus and your body’s antibodies can detect most infections within two weeks, with six weeks being the point where nearly all cases are caught. An oral swab or older antibody-only test takes about a month to catch most infections and up to three months to be fully reliable.
If you’ve had a specific exposure you’re worried about and you test negative early, a follow-up test at the three-month mark gives you the most confidence that nothing was missed.
How Often to Retest
For most people in a long-term monogamous relationship with a partner who has also been tested, routine annual screening beyond the basics isn’t necessary. But your testing schedule should increase with your number of partners and the types of sex you’re having. A good rule of thumb: get tested with every new partner, after any unprotected encounter with someone whose status you don’t know, and at least annually if you have multiple partners throughout the year.
People on PrEP are already built into a regular testing cycle, since PrEP prescriptions require STI screening every three months. If you’re not on PrEP but have a similar risk profile, matching that quarterly schedule is reasonable. And anyone diagnosed with one STI should be tested for others at the same time, since co-infections are common.