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A member asked:
Hi, a 4th gen hiv test would be somewhat accurate at 14 days post exposure? since p24 peaks around that day, and the prevalence of hiv-2 in the us is null, would be a good indicator?
2 doctors weighed in across 2 answers
15-20 days is approximate time to positivity so 14 days is a little bit early. 4th generation test done after 3 weeks of exposure is recommended.
Answered 6/9/2022
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If the result is positive it is accurate. A negative result warrants repeat testing at 6 weeks after exposure. Visit this site for info: HIV test window periods https://www.cdc.gov/hiv/basics/hiv-testing/test-types.html
Answered 6/9/2022
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