One of the most common questions we get is: how soon after a possible exposure should I test for HIV?
What is the window period?
The window period is the time between infection and when a test can reliably detect it. A test taken inside this period can be negative even if infection has occurred.
General guidance
- 4th generation (antigen/antibody) tests can detect infection earlier than antibody-only tests. Many people can be detected from around 21 days to 6 weeks after exposure.
- 3rd generation (antibody-only) tests generally need longer, often up to 3 months, for a reliable result.
Exact timing varies by product and by person, so always follow the window period stated in your kit's instructions.
A practical testing plan
- If you test early and get a negative result, treat it as provisional.
- Retest once the full window period for your kit has passed.
- If you have symptoms or ongoing risk, test regularly and consider speaking to a clinic.
Other STDs
HIV is not the only infection to consider. Syphilis, hepatitis B and C and others have their own testing windows. A combined kit, such as our HIV and Syphilis combination test, can be convenient.
Need help choosing?
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General information only; not a substitute for medical advice.