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Took PreP. Will this affect my test results?

Hey everyone,

I last had unprotected sex (insertive - I am a gay male) around May 18, 2019. I posted previously on here about being on PreP and how this would have possibly delayed results. I stopped taking my PreP on June 1, 2019 and waited the full 28 days until July 5, 2019 and was tested w/ a 4th generation duo - result was negative. I know this is not 100% accurate.

After this result, I immediately began retaking my PreP and did not have sex. I got retested on September 22, 2019 (while on PreP) and the result was again negative. Can I safely assume I am HIV negative?

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3191940 tn?1447268717
You are almost certainly negative, but HIV tests should always be taken without any anti-ARV drugs in your system.
Helpful - 0
Then why are those on PreP tested every 3 months if the test is most likely flawed each time?
It's definitely precautionary, and you should always follow the advice of your doctor.  If you have no antibodies that a test can detect, even when on PrEP, then you are almost certainly negative.  
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