The results of the four tests for infectious diseases mainly include hepatitis B surface antigen assay, hepatitis C antibody assay, human immunodeficiency virus antibody assay, and syphilis spirochete antibody assay. If you want to check for AIDS, the test result is to check for human immunodeficiency virus antibody assay, but you cannot diagnose AIDS by having a positive human immunodeficiency virus antibody assay; you need to confirm the two-step test in the test to make a clear diagnosis. That is, the initial screening for positive HIV antibodies from the infectious disease quadruple test needs to be followed by a follow-up test, and if both tests are positive, AIDS can be diagnosed. Therefore, the diagnosis of AIDS cannot be made by the four infectious disease tests alone, and further follow-up examinations are needed to make a definite diagnosis.