The hiv antigen antibody test is a combined HIV antigen antibody test. The WHO has clearly stated that the window period for AIDS is 14 to 21 days, so AIDS can be ruled out after two to three weeks with the use of a combined HIV antigen antibody test. AIDS is a chronic infectious disease caused by HIV infection and is also a sexually transmitted disease. In order to confirm the diagnosis of the disease, it is necessary to first diagnose the disease through tests, but there is a window period of 2-3 weeks between the time the body is infected with the virus and the time it can be detected through the HIV antigen-antibody combination test. Therefore, if it is not detected in 2-3 weeks, AIDS can be basically ruled out. Even if HIV is in the window period, it is still contagious. Therefore, if an individual is in the window period after engaging in high-risk behaviors that cannot be diagnosed for the time being, he or she should still do a good job of protecting himself or herself and preventing himself or herself from transmitting the disease to others.