If positive: If the test is positive, it is conclusive. In a small number of infected people it may take longer for the test to become positive. Blood Banks defer potential donors for one year from the time of exposure. For all practical purposes if the nucleic acid test is negative at 6 months after exposure the person is free of HIV. You may consult this site for more information: https://www.cdc.gov/hiv/basics/testing.html
Answered 12/8/2017
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