It seems a growing number of doctors and experts seem to believe that the 4th generation HIV tests are as good as conclusive at 28 days. However, I find this confusing given that ARS illness can strike anywhere from 2-4 weeks post infection. If, for example, the ARS illness struck at 4 weeks, then would a 4th gen test not be negative at this time. Am I right in thinking that during ARS illness, the 4th gen test would not be able to detect P24 antigen or IgM antibodies? I wonder if my understanding of this is incorrect, because otherwise it seems impossible that any experts could believe a 4th generation test is conclusive at 4 weeks.