When should I take an HIV test?
There are two very different reasons to test: something specific happened, or you are checking in on a routine. The right timing is different for each.
Diagnik Health Library · Updated
After a specific possible exposure
- Within 72 hours: contact a clinician about PEP. This is urgent and testing does not replace it.
- Before the window period has passed: a non-reactive antibody result cannot rule out that exposure.
- After the window period — up to about three months for antibody tests — a non-reactive result is meaningful for that exposure.
As a routine check
The CDC recommends everyone aged 13 to 64 is tested at least once as part of routine care, and more frequently for people with new or multiple partners or who share injection equipment. Many people also test at the start of a relationship, before deciding to stop using condoms.
Testing more than once
One test covers one point in time. If you tested early after an exposure, plan a second test after the window period rather than treating the first as final.
Tests mentioned in this guide
Frequently asked questions
- How long is the HIV window period?
- For antibody tests, guidance describes a window of up to about three months, with most people developing detectable antibodies sooner.
- Should I test again after a negative result?
- Yes, if the test was inside the window period for the exposure you are worried about, or if you have ongoing risk.
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Educational information only, not a medical diagnosis or treatment advice. Screening results always need confirmation by a clinician.
This guide is general health information about screening tests. It is not a diagnosis and does not replace care from a clinician. See our medical disclaimer.