If a person is living with AIDS, it can be detected during the pre-donation blood test. This is because the test is done in order to prevent blood from AIDS patients from entering the blood bank and thus infecting other people. The HIV antibody is the screening test that is performed before donating blood, and the corresponding test paper test is still relatively reliable. When the test is performed, if there is a large amount of HIV antibodies in the blood, it can be detected by the test paper, so a person with AIDS will not be able to donate blood successfully. However, sometimes, AIDS is not known to the person after he or she has just gotten it, and is still in the window period, so the corresponding antibody test may not be detected. However, further tests will be conducted afterwards, using HIV RNA quantification, which will screen out some of the AIDS patients within the window period. Therefore, if you have HIV when donating blood, it is possible to detect it through this screening process, and it is also possible to detect it through the later screening process. If it is detected, your own blood will be discarded and will not become transfused to others.