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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.
There's a period of time after a person is infected during which they won't test positive. This is called the HIV window period. The window period can be from 10 days to 3 months, depending on the person's body and on the HIV test that's used. During that time, you can test HIV-negative even though you're HIV-positive. You can still get HIV from someone who is in the window period.