Liver function tests cannot detect AIDS, and not only that, viral hepatitis such as hepatitis B and C cannot be diagnosed through liver function tests. Liver function tests can reflect the liver’s synthesis, transformation and excretion functions, and to a certain extent, reflect the severity of certain diseases, but cannot determine the specific disease. Of course, AIDS may cause significant abnormalities in liver function. At present, the diagnosis of AIDS in clinical practice mainly relies on relevant laboratory tests, mainly including screening tests and confirmatory tests. Screening tests include enzyme-linked immunosorbent assay, gelatin particle agglutination test, immunofluorescence test, and if the above tests are positive, further confirmatory tests should be performed, which mainly include immunoblotting test and radioimmunoprecipitation. Of course, epidemiologic history and clinical symptoms are also very important in the diagnosis of AIDS. A clearer diagnosis can also be made if the laboratory test turns from negative to positive for HIV antibodies. AIDS has a window period, about 80% of infected patients will appear positive after six weeks, therefore, timely examination of the antibody is negative, but also can not completely rule out AIDS.