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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.
Initial testing for HIV is designed to detect antibodies to the virus. More than 98% of people who have HIV will produce enough antibodies to HIV to be detected on tests within 3 months of the time they got infected.In very rare cases, it could take up to 6 months for someone to test positive.nitial testing for HIV is designed to detect antibodies to the virus. More than 98% of people who have HIV will produce enough antibodies to HIV to be detected on tests within 3 months of the time they got infected.