A member asked:

I took the duo test at 19, 27 & 79th day after the risk which was oral sex by a girl. all negative. can i conclude that i have no hiv 100% ? tks

A doctor has provided 1 answer
Dr. Julie Abbott answered

Specializes in Preventive Medicine

The HIV "duo" test: is called that because it combines an antibody test for the HIV 1 and 2 strains with a p24 antigen test. It is 99.8% accurate at 28 days increasing to 99.9% accurate at 90 days after potential contact. Apparently in 1/10th of 1 percent, a test could be positive after 79 or 90 days. If my test was negative after 79 days, I would believe I am not infected. PRACTICE SAFE SEX ALWAYS! Good wishes:)

Answered 11/18/2015

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Thank

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