Negative blood test for hiv. possible that it hit window of seroconversion. how often do you see false negatives after 1-2 months?

HIV testing imprving: The elisa test for HIV is sensitive ; specific for this infection. It is pretty reliable at >3 weeks after infection. If you are participating in risky behaviors (unprotected sex, intravenous drug use, exchanging sex for drugs...) the risk of acquiring the HIV continues. If 1x exposure you should repeat testing in 1 mo or if symptoms of acute infection (fever, rash, sore throat, swollen nodes).

Never in my career: False negative HIV means there is infection but the antibody test is negative. The situations where this occurs have to do with the timing of the test or continued risky behavior where a person is infected within days after the test. The home kits that use oral fluid are false negative 1 out of 12, according to cdc website on HIV testing. The blood test done at the right time is very accurate.