Blood donation can be tested for AIDS. If the blood test fails and the initial screening for HIV antibody is positive, the person will be notified by SMS or phone and advised to go to the hospital or local CDC for further retesting or confirmatory test. Of course in the high-risk groups need to pay attention to exclude the window period. Because in the window period, the HIV antibody is negative, but the body already has HIV. It is not recommended that high-risk people donate blood for the purpose of screening for HIV infection. Generally speaking, after the window period, if the HIV antibody is still negative, then the possibility of HIV infection is completely excluded.