And finally the 4TH Generation (ab/ag test) which is the most common test in the United States. Works like this the Antigen test is detectable immediately after infection, and only for the first few weeks. The antibody (ab) test has a window period of 4-12 weeks. Finally, the World Health Organization considers this DUO test conclusive at 6 weeks. Accuracy rate is 99.9%.
@ yeterlan2
