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When someone gets HIV, the body's immune system makes antibodies to try to fight the infection. Most HIV tests available today test for HIV antibodies. If HIV antibodies are present, it means that a person is infected with HIV. One type of HIV test detects the virus itself. This is called an RNA test. RNA testing is more expensive and much less common than antibody tests.
Fourth generation HIV tests (ELISA combined antigen/antibody) Fourth generation tests look for HIV antibodies, but also for something called p24 antigens. The p24 antigens are part of HIV itself, so you have a lot of these in your blood in the first few weeks after infection. This is why you are most infectious to others in this period too. Fourth generation tests can detect HIV from 11 days to 1 month after you have been infected.