To find out if you have AIDS, you need to have your blood drawn and tested for HIV antibodies. You can combine the P24 antigen and the AIDS antibody test, which can detect AIDS earlier than just testing for the AIDS antibody. If the test is negative, you can rule out that you have AIDS, but if you are still within the window period, you will need to be retested in a month. If the test result is positive, it does not immediately confirm that you are infected with HIV. This is because such a test has a certain rate of false positives. This means that a person who does not have HIV may also have a positive result when tested for HIV antibodies, so a confirmatory test is needed. If the test is positive, the diagnosis is confirmed. If the test is not too sure, you need to take a new blood test after some time.