What are antibody/antigen tests for HIV?
These tests 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.
From: Pregnancy and HIV Testing WebMD Medical Reference
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