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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.
For antibody tests, if you get a negative result within 3 months of your most recent possible exposure, you need to get tested again at the 3-month mark. For RNA tests or antibody/antigen tests, that timeframe may be shorter.ome people who test positive for HIV were not aware of their risk. Thatâs why CDC recommends that providers in all health care settings make HIV testing a routine part of medical care for patients aged 13 to 64, unless the patient declines (opts out).