How can I know if I have HIV?
There are several types of tests that screen blood (and sometimes saliva) to see if you are infected with HIV.
Newer tests can detect the presence of HIV antigen, a protein, up to 20 days earlier than standard tests. This helps prevent spread of the virus to others and start treatment earlier. It is done with a pinprick to the finger.
From: Pregnancy and HIV Testing WebMD Medical Reference
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