My recommendation is to get tested 2-4 weeks, 3 months, and 6 months after a risky exposure. Using a sensitive antigen/antibody HIV test, of those who are infected, most will test positive at 1 month; almost all will test positive at 3 months, and the rest will test positive at 6 months An antigen/antibody test performed by a lab on blood from a vein can usually detect HIV infection 18 to 45 days after exposure. An antigen/antibody test done with blood from a finger prick takes longer to detect HIV (18 to 90 days after exposure).

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