HIV Tests and PEP: Which Steps Are Time-Sensitive?
What to do after possible HIV exposure, how test windows differ and why follow-up matters after preventive medicine.
Seek urgent assessment after recent exposure
If you may have been exposed to HIV in the past 72 hours, seek urgent medical assessment. When appropriate, post-exposure prophylaxis (PEP) needs to start as soon as possible within that period. Contact an emergency department, sexual health service or other local provider that can assess PEP. Keep seeking advice if more time has passed, as testing and other prevention steps still matter.
Ask which test fits the timeline
Lab antigen and antibody tests using blood from a vein can generally detect HIV sooner than antibody-only home tests. A clinician may use a nucleic acid test in specific situations. A negative result can be too early to interpret, and a reactive self-test needs clinical confirmation. Tell your clinician about use of PEP or HIV pre-exposure prophylaxis (PrEP), which can affect the choice and timing of tests.
Arrange follow-up before leaving
The initial test establishes a baseline. Your clinician can set follow-up dates and explain the role of different tests after PEP. Ask where and when to return and what other STI screening is appropriate. If ongoing HIV exposure is possible, ask about PrEP and a continuing screening plan.
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