Question

Does PEP extend the window period for testing?

21 October 2008. Related: All topics, HIV testing, PEP/PEPSE.

Is PEP extending the ‘window period’ for antibody testing?
Two weeks ago had a high risk sexual exposure, Dr. precribed Truvada for PEP for 28 days. Does Truvada extend the window period for HIV antibodies to show up on testing? Also, have read that the rapid tests, e.g., Oraquick are more sensitive and may reduce the window period–any truth to this?
Thanks

Answer

Answer: Simon Collins

Yes. This is because the PEP has been reported as delaying infection if it is not successful at preventing it.

This means that people are recommended to wait 28 days after the end of PEP to test again for HIV and to wait 90 days for a negative result to be confirmed.

Modern tests are accurate and effective. There is more on HIV testing here.