[Question #5927] HIV Testing and Risk

20 months ago
Dear Doctor,

I’m in a monogamous relationship with my girlfriend now. Before we started having unprotected sex, we each had a std test and everything was negative.

However, it was recently revealed that my girlfriend had unprotected sex once with someone else 7 weeks before we took the test (this was before we met as well) . I know that HIV tests have window periods, so I’m worried about the risk her unprotected sex carries and the accuracy of the test we took. 

The test we took for hiv was a fourth gen ag/ab test. My question is: how reliable was that test 7 weeks after her exposure? Am I at risk for having unprotected sex with her? Is additional testing needed for me/her?

Thank you in advance for your kind help!!


H. Hunter Handsfield, MD
H. Hunter Handsfield, MD
20 months ago
Welcome to the forum. Thanks for your confidence in our services.

Congratulations to both you and your partner on a responsible approach to your new relationship. I wish more people had mutual STD testing when starting new relationships!

To your main question:  the AgAb (4th generation) HIV blood tests are 100% conclusive any time 6 weeks or more after the last exposure. So your partner's test 7 weeks after her last sexual event was conclusive. No additional testing is necessary.

Thanks for the thanks in advance! I hope this information settles your concerns. Let me know if anything isn't clear.