What Are The Three Different HIV Blood Tests? There are three kinds of HIV tests: the HIV Antibody test, HIV Antibody/Antigen combination test, and HIV Nucleic Acid (NAT) RNA test. Each HIV test has its own testing window and each test detects HIV by looking for different specimens in a blood sample. Test windows represent the incubation periods or time frames that have to elapse in order for the virus or immune response to be detected via the various testing methods.

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