Some say the DUO is conclusive at 4 weeks and over, some, including me, always go for testing at 12 weeks post exposure. Take the duo or any antibody test at the 6 week appointment and then follow up at 12 weeks post exposure with another antibody test for a conclusive result.
If the antigen becomes undetectable after about 4 weeks, the antibody part of the test for antibodies for "HIV-1" if present.
Either way, a negative with a DUO or 3rd gen test at 6 weeks is extremely unlikely to change at 12 weeks ((almost conclusive with the DUO)).
And why on earth have you made so many threads ??????