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 can you tell if you are infected with HIV? 1.Epidemiological history: It is the acute infection period. 2, clinical manifestations: immunocompromised: continuous irregular fever after 1 month; continuous unexplained generalized lymph node enlargement (lymph node enlargement diameter greater than 1CM); chronic diarrhea more than 4~5 times a day, weight loss greater than 10% in 3 months; combined with oral candidiasis and other 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. As well as the basis for confirmation of relevant laboratory tests. Classification of confirmed AIDS cases: 1. HIV-infected patients: HIV-positive or HIV-antigen-positive with no clinical symptoms or clinical symptoms and laboratory test results that do not meet the AIDS diagnosis criteria. 2.AIDS cases: those who have any of the epidemiological history and clinical manifestations, as well as those who have confirmed HIV antibody positivity, and the confirmation basis 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.