The diagnosis of HIV must be based on a comprehensive analysis of the epidemiological history of exposure, clinical manifestations and laboratory findings, and must be made carefully. Regardless of the stage of HIV infection, there must be a positive laboratory test for HIV antibodies. At this stage, HIV laboratory testing in China is mainly for HIV antibody testing, which requires initial screening and confirmation tests. Only when the HIV antibody is confirmed to be positive, can the diagnosis of HIV infection be confirmed. Combined with the performance of each period, it can confirm whether you have AIDS or not. How to determine whether you are HIV-infected? 1. epidemiological history: the acute infection period. 2. clinical manifestations: immunocompromised: persistent irregular fever after 1 month; persistent generalized lymph node enlargement of unknown cause (lymph node enlargement diameter greater than 1CM); chronic diarrhea more than 4~5 times a day, 3 months weight loss greater than 10%; combined with oral Candida and other various signs of opportunistic infections; special attention is paid to young patients can appear dementia. 3, laboratory tests: anti-HIV antibody positive, confirmed by confirmation test. and the basis for confirmation of relevant laboratory tests. Classification of confirmed AIDS cases: 1. HIV-infected patients: those with positive HIV antibodies or positive HIV antigens, without clinical symptoms or clinical symptoms and laboratory test results that do not yet meet the AIDS diagnosis criteria. 2. AIDS cases: those with any of the epidemiological history and clinical manifestations, as well as those with confirmed positive HIV antibodies, and the basis for confirmation of relevant laboratory tests. 3. Infant HIV/AIDS cases: Infants less than 18 months of age with positive anti-HIV antibodies probably from an infected mother. Confirmation of diagnosis requires a positive result for any of HIV isolation culture, HIV nucleic acid PCR test or HIV antigen (P24). Knowing and understanding these basic issues will allow you to correctly determine if you are infected with HIV or have AIDS.