The HIV Antigen/Antibodies Test is the recommended standard rapid test for routine HIV Screening. It typically sees quick results in just 1-2 business days and is one of the most affordable HIV tests available. The HIV Antigen/Antibodies test, also known as a 4th Generation HIV Test, looks for both antibodies to the HIV virus and the p24 Antigen which is specific to HIV. Antibodies to HIV typically begin to develop several weeks after exposure. In the majority of people, these antibodies will be detectable by 12 weeks from the point of exposure. In some people, antibodies may be detectable as early as 4 weeks from exposure.