A “standard” STI test doesn’t exist as a single fixed panel. What you’re tested for depends on your age, sex, sexual partners, and risk factors. That said, the most common infections included in routine screening are chlamydia, gonorrhea, syphilis, and HIV. Beyond those four, your provider may add hepatitis B, hepatitis C, or trichomoniasis depending on your situation.
The reason this gets confusing is that many people assume one blood draw or one urine sample checks for everything. It doesn’t. Each infection requires its own specific test, and some STIs you might expect to be included, like herpes, are deliberately left out. Here’s what actually gets tested and why.
The Four Core Infections
Chlamydia, gonorrhea, HIV, and syphilis form the backbone of most standard STI panels. They’re the infections that public health guidelines prioritize because they’re common, often symptomless, and either curable or manageable when caught early.
Chlamydia and gonorrhea are tested together using a urine sample or a swab. For women, a vaginal swab is actually the preferred collection method and performs slightly better than urine, which can miss up to 10% of infections compared to swab samples. Self-collected vaginal swabs are just as accurate as those collected by a clinician. For men, a urine sample works as well as, or better than, a urethral swab. Both infections are detected using a highly sensitive DNA-based test that identifies the bacteria’s genetic material directly.
HIV is tested through a blood draw or a rapid finger-prick test. The current standard is a combination test that looks for both antibodies your body produces and a protein from the virus itself. This dual approach shortens the detection window compared to older tests, though it still takes roughly 18 to 45 days after exposure before results are reliable. The CDC recommends that everyone between ages 13 and 64 get tested for HIV at least once in their lifetime.
Syphilis requires a blood test and uses a two-step process. The first test screens for signs of infection, and if it comes back positive, a second, different type of blood test confirms the result. Neither test alone is sufficient because each one can produce false positives on its own. Both the screening and confirmation steps need to agree for a syphilis diagnosis.
What Changes Based on Who You Are
The CDC doesn’t recommend the same panel for everyone. Your screening depends heavily on your age, sex, and sexual history.
Women under 25 who are sexually active should be tested for chlamydia and gonorrhea every year. Women 25 and older only need annual testing if they have new or multiple partners, or a partner with an STI. All women ages 13 to 64 should be tested for HIV at least once. Syphilis screening is recommended for women with specific risk factors like multiple partners or living in a high-prevalence area.
Heterosexual men get a narrower panel. There isn’t strong enough evidence to recommend routine chlamydia or gonorrhea screening for low-risk heterosexual men, though it may be offered in high-prevalence settings like STI clinics. HIV testing is recommended at least once for all men ages 13 to 64, and syphilis screening applies to men with elevated risk factors or those under 29 in certain populations.
Men who have sex with men receive the most comprehensive screening. The recommendation is annual testing for chlamydia, gonorrhea, syphilis, and HIV at minimum. Men at higher risk (multiple or anonymous partners) should be tested every 3 to 6 months. Importantly, chlamydia and gonorrhea testing for this group includes swabs at all sites of sexual contact: urethra, rectum, and throat for gonorrhea; urethra and rectum for chlamydia. A urine-only test would miss rectal and throat infections entirely.
Infections That May Be Added
Hepatitis C screening is now recommended at least once for all adults 18 and older. It’s a simple blood test. Pregnant women should be screened during each pregnancy. People who have ever injected drugs, received blood transfusions before 1992, or are living with HIV should also be tested regardless of age.
Hepatitis B is routinely included in prenatal screening panels and recommended for people at elevated risk, such as those with multiple sexual partners or those who share injection equipment.
Trichomoniasis is not part of most standard panels but is added for women in high-prevalence settings (STI clinics, correctional facilities) or women with multiple partners, a history of STIs, or HIV. It’s rarely screened in men. When it is tested, it uses a vaginal swab.
HPV isn’t tested through a typical STI panel. Instead, it’s part of cervical cancer screening. Women ages 21 to 29 get a Pap test every three years, and women 30 to 65 can add HPV testing every five years alongside their Pap. There’s no routine HPV blood test or swab offered as part of an STI screening visit.
Why Herpes Isn’t Included
This is the biggest surprise for most people. Herpes (HSV-1 and HSV-2) is specifically excluded from standard STI panels, and it’s not an oversight. The U.S. Preventive Services Task Force actively recommends against routine herpes screening in people without symptoms.
The reason is the available blood tests are unreliable at the population level. Nearly 1 in every 2 positive HSV-2 results in a general primary care population would be a false positive. The more accurate confirmation test (called a Western blot) isn’t widely available, making it impractical for routine use. On top of that, about 48% of the U.S. population already carries HSV-1, and a blood test can’t distinguish between an oral cold sore and a genital infection. A positive result in someone with no symptoms creates anxiety, potential stigma, and unclear treatment decisions with no proven health benefit.
If you have symptoms that look like herpes (blisters, sores, recurring ulcers), a provider can swab an active lesion directly. That’s a different, much more accurate test than the blood screening.
Testing Windows That Matter
Getting tested too soon after a possible exposure can produce a false negative. Each infection has a window period where the test can’t yet detect it.
- Chlamydia and gonorrhea: DNA-based tests can detect these infections within about 1 to 2 weeks after exposure.
- HIV: The combination antigen/antibody blood test typically becomes reliable around 18 to 45 days after exposure. In some cases, the detection window can extend longer. A negative result at 45 days is considered highly reliable, but testing at 90 days provides maximum certainty.
- Syphilis: Antibodies usually become detectable within 3 to 6 weeks after exposure, though it can occasionally take longer.
If you’re testing after a specific exposure, timing matters. Testing at 2 weeks will catch chlamydia and gonorrhea, but you may need to return at 4 to 6 weeks for accurate syphilis and HIV results.
At-Home Kits vs. Clinic Panels
At-home STI test kits have become widely available and typically cover the same core infections. A common configuration, sometimes called a “Standard 5” panel, tests for chlamydia, gonorrhea, trichomoniasis, HIV (including the p24 antigen), and syphilis. You collect your own samples at home (usually a vaginal swab or urine sample plus a finger-prick blood sample) and mail them to a lab.
These kits use the same types of lab tests as a clinic. The key difference is that at-home kits test only the sites you collect from. If you need rectal or throat swabs for chlamydia and gonorrhea, most at-home kits don’t include them, or they require ordering a separate add-on. A clinic visit allows a provider to test all relevant sites based on your sexual history, which is especially important for men who have sex with men.
What to Ask For
If you go to a clinic and ask for “a full STI test,” you may not get everything you expect. Some providers default to chlamydia and gonorrhea only, while others include HIV and syphilis. Hepatitis C and trichomoniasis are often left out unless you specifically request them or have clear risk factors.
Your best move is to ask explicitly which infections are being tested. If you want a comprehensive panel, request chlamydia, gonorrhea, syphilis, HIV, and hepatitis C by name. If you have a cervix, make sure your cervical cancer screening is up to date separately. And if you need testing at multiple body sites (throat, rectum), say so, because those won’t happen automatically with a standard urine-based test.