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In general, antibody tests that use blood can detect HIV slightly sooner after infection than tests done with oral fluid. It can take 3 to 12 weeks (21-84 days) for an HIV-positive personâs body to make enough antibodies for an antibody test to detect HIV infection. This is called the window period.
HIV tests can take anywhere from 20 minutes to 2 weeks to get results back. However, with HIV, there is a window period (period of time that you may be infected, but not test positive for the antibodies), so you may need to be retested depending on how long ago your possible exposure was.