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Hi, and thanks for your question.
The window period (the time between when a person comes in contact with a sexually transmitted infection (STI) and when the STI will show up on a test) for HIV testing is 3 months, or 90 days. If you have had a negative HIV antibody test 90 days or more after a high-risk exposure, then this means you do not have HIV from that encounter.
Let us know if this does not answer your question or if you have any more questions or concerns.