Laboratory tests for HIV mainly include HIV antibody, antigen, HIV nucleic acid, HIV genotypic drug resistance and cellular immune function tests. HIV1/2 antibody test is the gold standard for the diagnosis of HIV infection, HIV nucleic acid quantification and CD4+ T-lymphocyte count can help to select therapeutic drugs, determine the progress of the disease, as well as the efficacy of the treatment and prognosis; HIV genotypic drug resistance test can provide scientific guidance for the selection of highly effective antiretroviral therapy program and replacement. HIV1/2 antibody testing includes screening tests (including initial screening and retesting) and supplemental tests. HIV1/2 antibody screening methods include enzyme-linked immunosorbent assay (ELISA), chemiluminescence or immunofluorescence tests, rapid tests, immunoblotting, etc. Most HIV-1-infected patients have been found to be infected with HIV-1, and the majority of them have been found to be infected with HIV-1, and the majority of them have been found to be infected with HIV-1. Most HIV-1 infected patients are seropositive within 3 months. 2. Antigen detection The P24 antigen of HIV-1 can be detected during the window period before the emergence of antibodies, which is conducive to early diagnosis, but it is more expensive and only used for special needs. 3. Viral load measurement Viral load is usually expressed as the number of copies of HIV-RNA per milliliter of plasma (copies/ml) or in international units (IU/ml). Viral load measurement is useful for predicting the course of the disease, providing a basis for initiating treatment, evaluating the efficacy of treatment, and guiding the adjustment of treatment regimens, as well as for the early diagnosis of HIV infection. 4. HIV genotypic drug resistance test The results of HIV drug resistance test can provide an important reference for the formulation and adjustment of AIDS treatment program. 5. CD4+ T lymphocyte test Clinical significance is to determine the immune status and disease progression, determine the stage of disease and treatment timing, evaluation of the effectiveness of treatment, but also according to the value of CD4+ T cells to decide whether to carry out the prevention of specific opportunistic infections. It is recommended that HIV-infected patients should go to specialized hospitals for examination and treatment according to medical advice.