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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.
If the initial test result is positive for HIV infection, then follow-up testing will be done to make sure that the diagnosis is correct. If the initial test result is negative and the test was done during the window period, re-testing should be done 3 months after the possible exposure to HIV.