To check for HIV infection, the most common method is to draw blood. Check the blood inside there is no infection of AIDS antibodies or virus, 1, check the antibodies of AIDS. This is the most commonly used in clinical practice and can be done in all hospitals, usually the same day results, the price is about a few dozen dollars, but the premise is to test after 12 weeks of high-risk behavior, the accuracy rate is high. 2, check the HIV antigen, also known as P24 antigen test, this will be a little earlier than the HIV antibody to find out whether there is no infection, usually about 2 weeks after the high-risk behavior can be checked out. 3, check the HIV nucleic acid test, Check the nucleic acid test of HIV virus. This can be earlier than the antigen to find out whether HIV infection, but the price of nucleic acid testing is very expensive, generally about 1000 yuan, and the report will take longer.