The HIV antigen-antibody combination test is a 4th generation test for HIV. Antigenic antibodies to HIV can be detected in the body of an infected person about 2-3 weeks after infection with HIV. Therefore, if you want to be tested for HIV, you can go to the hospital for HIV antigen antibody testing 3 weeks after high-risk behavior. If the test is negative, HIV infection can be basically ruled out. If the test is positive, a confirmatory test for HIV should be performed to detect the presence of HIV antibodies in the patient’s body by a protein blot test. If the confirmatory test is also positive, the patient is infected with AIDS. If the confirmatory test is negative, the patient is not infected with AIDS.