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hiv testing

how long after an exposure is an Ag/Ac hiv blood test accurate? i heard something about 3-4 weeks after the possible exposure, is that true?
3 Responses
Avatar universal
You never had an exposure.
Avatar universal
A negative ag/ab test at 4 weeks is a good sign but retest at 3 months and  at 6 months to be 100 percent sure
Avatar universal
Wrong--6 months is outdated.
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