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Find a Local Lab →Every STD test has a window period: the time between exposure and the point where the test can reliably detect infection. Test too early and a negative result means very little. This guide gives the window for every infection, the earliest reliable test date, and a schedule you can follow after a specific exposure.
Window periods at a glance
| Infection | Test | Earliest reliable test | Conclusive at |
|---|---|---|---|
| Chlamydia | Urine or swab NAAT | 1–2 weeks | 2 weeks |
| Gonorrhea | Urine or swab NAAT | 1–2 weeks | 2 weeks |
| Trichomoniasis | Urine or swab NAAT | About 1 week | 3–4 weeks |
| Mycoplasma genitalium | Urine NAAT | 1–2 weeks | 2–3 weeks |
| HIV | RNA (nucleic acid) test | 10 days | 33 days |
| HIV | Lab antigen/antibody (4th gen) | 18 days | 45 days |
| HIV | Rapid antibody (finger prick or oral) | 23 days | 90 days |
| Syphilis | Blood (treponemal + RPR) | 3 weeks | 6 weeks (up to 90 days) |
| Herpes 1 and 2 | Type-specific IgG blood test | 4–6 weeks (partial) | 12–16 weeks |
| Hepatitis B | Blood (surface antigen) | 3–6 weeks | 6 weeks |
| Hepatitis C | Blood (antibody) | 8–9 weeks | 12 weeks (RNA test detects from 1–2 weeks) |
| Hepatitis A | Blood (IgM antibody) | 2–7 weeks | 7 weeks |
“Earliest reliable” means most infections are detectable by then. “Conclusive” means a negative result at that point effectively rules the infection out for that exposure.
A testing schedule after one exposure
Count days from the exposure, not from when you started worrying.
Day 0 to 3. No test is useful yet. If the exposure carried a real risk of HIV (a partner known to have HIV with a detectable viral load, or a high-prevalence situation), contact a clinician or emergency room within 72 hours about PEP, which can prevent infection. Consider doxycycline post-exposure prophylaxis (doxy-PEP) if a clinician offers it for your risk group.
Day 7 to 14: first test. Chlamydia and gonorrhea (together, $99) plus trichomoniasis if there was vaginal exposure. If you have symptoms, test as soon as they appear and repeat at day 14 if negative.
Day 10 to 14 (optional): early HIV. The HIV RNA test ($129) detects the virus from about 10 days. Worth it after a high-risk exposure when waiting six weeks is not tolerable.
Week 6: the main test. A 10-test panel ($139) or, at minimum, HIV (4th gen) and syphilis. At six weeks, chlamydia, gonorrhea, HIV, syphilis, and hepatitis B are all reliably detectable, so this is the single best date if you will only test once.
Week 12: closing the loop. Herpes IgG and hepatitis C antibody become conclusive. A repeat HIV antibody test at 90 days is conclusive by any method. If everything is negative at 12 weeks, that exposure is resolved.
Why early negatives mislead
Tests look for the organism’s genetic material (NAAT), its proteins (antigen tests), or your immune response (antibody tests). Bacteria need days to multiply to detectable levels; antibodies take weeks to appear. A test on day 3 is not wrong, it is just measuring before there is anything to measure. Treat any negative taken before the window closed as provisional.
Symptoms change the timeline
Symptoms mean test immediately, whatever the window says, because a symptomatic infection is usually at a detectable level. Typical onset after exposure: gonorrhea 2 to 14 days, chlamydia 1 to 3 weeks, trichomoniasis 5 to 28 days, herpes 2 to 12 days, syphilis sore about 3 weeks, acute HIV illness 2 to 4 weeks. If a symptomatic test is negative, retest after the window.
Testing after a partner tests positive
Do not wait for the window. If a partner is diagnosed with chlamydia, gonorrhea, trichomoniasis, or syphilis, get tested now and, in most cases, treated the same day regardless of your result, since the exposure is confirmed. Expedited partner therapy, allowed in most states, provides that treatment through your partner’s clinician.
Retesting after treatment
For chlamydia, gonorrhea, and trichomoniasis, retest 3 months after treatment. Reinfection from an untreated partner is common. For syphilis, follow-up blood tests at 6 and 12 months confirm the cure. A test-of-cure is also recommended for throat gonorrhea (7 to 14 days) and chlamydia in pregnancy (4 weeks).
Putting it together
- Single exposure, no symptoms: test at 2 weeks (chlamydia, gonorrhea) and 6 weeks (panel), then herpes and hepatitis C at 12 weeks if you want a complete answer.
- High-risk HIV exposure: PEP within 72 hours, HIV RNA at 10 to 14 days, 4th-gen test at 6 weeks, antibody test at 12 weeks.
- Symptoms: test now, retest after the window.
- Partner positive: test and treat now.
The bottom line: two weeks for chlamydia and gonorrhea, six weeks for the main panel, twelve weeks for a conclusive answer on everything. A walk-in lab makes each of those a 5-minute stop with results in 1 to 2 days.
Frequently asked questions
How soon after unprotected sex can I get tested for STDs?
Chlamydia and gonorrhea are reliable at 2 weeks, HIV at 18 to 45 days with a lab antigen/antibody test (about 10 days with HIV RNA), syphilis at 6 weeks, hepatitis B and C at 6 to 9 weeks, and herpes at 12 weeks. Testing earlier can produce a false negative.
Can an STD show up in 3 days?
Generally not on a test. Symptoms of gonorrhea can start within a few days, and an HIV RNA test can detect infection from about 10 days, but no standard test is reliable at 3 days. Use that time to arrange testing, not to conclude you are clear.
What is the best single date to test after exposure?
Six weeks. At that point chlamydia, gonorrhea, HIV, syphilis, and hepatitis B are all reliably detectable. Add a herpes and hepatitis C test at 12 weeks for a complete answer.
Should I test right away after exposure?
Yes, if you have symptoms or want a baseline, but plan to retest after the window. If you had a high-risk HIV exposure within the last 72 hours, seek PEP immediately instead of waiting for a test.
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See Tests & Prices →This article is for general information only and is not medical advice. It does not replace an evaluation by a licensed clinician. If you have symptoms or a known exposure, seek care promptly. RapidSTDTests.com is an informational referral website and may be compensated when you order testing through our links.