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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.
Now is the best time to test for HIV. Know your HIV and STD status today. If you had a recent unprotected sexual encounter with someone whose STD status you do not know or who uses intravenous drugs, it is important that you get tested for HIV and other STDs today. Most people will develop detectable antibodies as soon as 2-3 weeks after exposure, but in rare cases, it may take up to 3 months.