PRIVATE CARE FILE
When to test after exposure: STD window periods
Window periods depend on the infection and test method. Use these ranges to discuss your plan with a clinician, not as a guaranteed date to exclude every infection. Symptoms should be assessed without delay.
5 min readUpdated 2026-09-06
Request a private appointment
What are common testing windows?
| Test | Time after exposure |
|---|---|
| Chlamydia / gonorrhoea — symptom-free screening | Commonly 2 weeks in NHS guidance |
| HIV — laboratory vein-blood antigen/antibody | Usually 18–45 days |
| HIV — rapid fingerstick antigen/antibody | Usually 18–90 days |
| HIV — antibody-only test | Usually 23–90 days |
| HIV — nucleic acid test (NAT) | Usually 10–33 days |
| Syphilis — blood screening | A repeat may be needed up to 12 weeks, depending on assessment |
Can an early test still be useful?
A clinician may arrange a baseline now and a repeat later. An early negative does not exclude a new infection. Disclose PEP, PrEP and recent treatment because they can change the testing plan.
What should I write down at the appointment?
- The exact test, method and specimen site.
- Which exposure date the test is addressing.
- Any repeat date and what changes after a new exposure.
- Who reviews the result and how to get help if symptoms appear.
FAQ
Is day 14 appropriate for every test?+
No. Infections and test methods have different windows. Do not use one date to interpret every result.
MEDICAL SOURCES
NEXT IN THE GUIDE