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Most people develop detectable HIV antibodies within three months of infection, the average being 20 days. In rare cases, it can take 6-12 months. For this reason, the CDC recommends testing six months after the last possible exposure, i.e, unprotected vaginal, anal, or oral sex, or sharing needles. You can be tested at your doctorâs office, local health department, hospital, and sites specifically set up to provide HIV testing.
Antibody testing at 4 weeks can give you a good indication of your HIV status, but you need a test at 12 weeks after the exposure to be considered HIV negative. Figure 8: Timeline for HIV infection, immune responses and window period for tests.