Thank you for your inquiry. From what we gather from the question, you were asking about the conclusiveness of a fourth generation duo test at four weeks.
The fourth generation test is referred to as a duo test because it looks for antibodies AND P24 protein antigens. P24 is a protein associated with the viral capsid. It is detectable immediately after infection, and only for the first few weeks. The antibody test has a window period of four to twelve weeks. Most HIV specialists consider this duo test conclusive at six weeks. However, official HIV testing guidelines still recommend re-testing at twelve weeks for completely conclusive results (1).
Recommendation: Refer to a health care provider for HIV testing.
AIDS Vancouver Helpline/Online, Rashell
If you are satisfied with the Helpline service, please consider donating.References:
1.) CATIE Testing Fact Sheet