HIV testing needs to be registered with the Department of Infection, some infectious disease hospitals have a special AIDS department, then directly registered with the AIDS department. In some places, you can go to the local CDC for examination. For the diagnosis of HIV, at present, the primary screening is mainly to do HIV antibody screening, if the HIV antibody is positive, you need to do further confirmatory test, and only if the confirmatory test is also positive, can you be clearly diagnosed with HIV infection. If the confirmatory test is negative, a positive initial screening is a false positive. For high-risk groups, you need to get tested only after the window period, because even if the test is negative during the window period, HIV infection cannot be completely ruled out.