The accuracy rate is relatively high at 8 weeks after high-risk exposure to HIV, but usually needs to be reviewed after 3 full months for confirmation. AIDS is caused by human immunodeficiency virus infection, usually transmitted through sexual intercourse, blood, mother and child, etc. It mainly destroys human CD4+ T lymphocytes, causing defects in the body’s immune function, which in turn causes infections and tumors. Currently there are three commonly used methods of HIV testing, the first for the third generation of reagent testing, is the detection of HIV-specific antibodies, generally in about 3 weeks of infection can be detected; the second for the detection of HIV-specific antibodies, for the fourth generation of testing, 2 to 6 weeks after exposure can be detected, the third test is the nucleic acid detection, blood sampling and testing, which is more expensive and is not used for routine screening . Using the third and fourth generation testing methods, the accuracy of HIV testing is higher at 8 weeks after high-risk behavior, but generally needs to be reviewed after three months. If you have high-risk behavior, you should go to a regular hospital in time and be tested under the guidance of a doctor.