Guides
HIV testing and the window period
Why timing and the type of HIV test can affect a result.
Why timing mattersNo HIV test can detect an infection immediately after exposure. The time between exposure and when a test can detect HIV is called the window period. Different antibody, antigen/antibody, and nucleic acid tests have different windows; ask a clinician when and whether you should test again.A positive self-test result requires follow-up testing with a healthcare provider. Follow the kit instructions carefully and seek clinical advice if the result is invalid or unclear.Recent possible exposureIf HIV exposure may have occurred within the last 72 hours, seek urgent medical care immediately to discuss post-exposure prophylaxis (PEP). Do not wait for a home kit or result to seek help.Sources: CDC, HIV Testing and CDC, Clinical Guidance for PEP.
A note about testing
At-home tests differ in their sample, detection window and laboratory requirements. A negative result may not rule out an infection. Speak with a qualified healthcare professional.
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