Describe exposures, previous results, PrEP/PEP use and symptoms. A negative baseline test is useful but does not exclude the exposure that just occurred.
Ask whether the test is an antibody test, a laboratory venous antigen/antibody test, a finger-stick combination test or a NAT. Recent exposure or acute symptoms may call for additional tests rather than a rapid antibody test alone.
Without antiretroviral use, CDC usual detection windows are 10–33 days for NAT and 18–45 days for a venous laboratory antigen/antibody test. The windows are 18–90 days for a finger-stick combination test and 23–90 days for antibody tests. These ranges are not an individualized guarantee.
An early negative may need repeat testing. A reactive screening result needs confirmatory testing and prompt clinical contact. A confirmed positive result should connect you to HIV care; a negative result can connect you to appropriate prevention.
Your follow-up date depends on assay, exposure timing, ongoing risk and PrEP/PEP use. CDC’s post-PEP schedule differs from ordinary untreated-infection windows. If tests conflict or acute HIV is suspected, additional testing and a clinician-managed prevention plan are needed. Keep the follow-up even if you feel well; symptoms are an unreliable testing strategy.