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The Center for Disease Control and Prevention estimates that 1.2 million people in the United States are living with HIV. Diagnostic tests have various uses and benefits for patients with HIV or AIDS, including determining the presence of the disease and measuring the effectiveness of treatments. Several types of diagnostic tests exist for the detection of HIV/AIDS, including those that test for antibodies or analyze RNA. Another type of diagnostic, CD4 testing, counts T-cells and is used to monitor the immune system function in HIV-positive patients.