Jul 21, 2018 · Nearly conclusive: The HIV antigen - antibody (AgAb, "combo", "4th generation") blood tests in theory are conclusive by 4 weeks and usually are, but in rare cases (1-2%) it takes up to 6 weeks. 5 1/2 weeks probably is close enough. However, if risk was especially high -- like unprotected vaginal or anal sex with a known HIV infected partner Feb 7, 2020 · Hi thanks for the questionWindow period of fourth generation HIV test is 4 weeks.The window period is time between exposure to HIV infection and the point when the test will give an accurate result. During the window period a person can be infected with HIV and be very infectious but still test HIV negative. Routine serologic screening of patients at risk for HIV-1 or HIV-2 infection usually begins with an HIV-1/-2 antigen and/or antibody screening test, which may be performed by various US Food and Drug Administration approved assay methods, including rapid HIV antibody tests, enzyme immunoassays, and chemiluminescent immunoassays. A test that is 100% sensitive would identify all HIV-positive people who take the test. Many HIV tests have 99% sensitivity. A test with this sensitivity would identify 99% of HIV-positive people, but would miss 1% of them. They would get ‘false negative’ results. A sub-optimal test, with only 94% sensitivity, would identify 94% of HIV Jun 21, 2022 · UK guidelines recommend a window period of six weeks for a 4th generation antigen/antibody test. By this time 99% of infections will be detected . Testing after only four weeks will detect 95% of infections. A negative result at 6 weeks with a 4th generation test does not need to be confirmed. Jun 1, 2021 · An HIV antibody response can be detected as early as two weeks in a few people and in more than 99.9% of people by 12 weeks. An antibody test at 4 weeks will detect 95% of infections. Antibody testing at 4 weeks can give you a good indication of your HIV status, but you need a test at 12 weeks after the exposure to be considered HIV negative. .

3rd generation hiv test at 8 weeks