How soon after risky sex can you be 100% sure you are clear of HIV?

There is no single correct answer to this question. One recommended strategy is to get tested 1, 3, and 6 months after a risky exposure. Using a standard antibody HIV test, of those who are infected, some will test positive at 1 month; almost all will test positive at 3 months; and the rest will test positive at 6 months.

For more information, please see the Getting Tested section of the Web site.