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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.
Antibody/antigen tests. These tests are recommended by the CDC and can detect HIV up to 20 days earlier than standard tests. They check for HIV antigen, a part of the virus that shows up 2-4 weeks after infection.These tests can also detect HIV antibodies.A positive result for the antigen allows treatment to begin earlier and the patient to avoid infecting others. These are blood tests only. Rapid antibody/antigen test.hey check for HIV antigen, a part of the virus that shows up 2-4 weeks after infection. These tests can also detect HIV antibodies. A positive result for the antigen allows treatment to begin earlier and the patient to avoid infecting others. These are blood tests only. Rapid antibody/antigen test.