How accurate is 3rd generation HIV test after 4weeks?

Yes. Modern HIV tests are very accurate. Testing earlier, for example after four week, only detects 95\% of infections. Testing earlier needs a confirmatory test three months after the risk.

When is a 3rd generation HIV test conclusive?

The window period is time between HIV infection and the point when a test will give an accurate result. Different types of tests have different window periods. 4th generation antibody/antigen (Ab/Ag) tests: 45 days. 3rd generation antibody only tests: 60 days.

What happens if my HIV test is negative 3 months later?

If you get an HIV test within 3 months after a potential HIV exposure and the result is negative, get tested again in 3 more months to be sure. If you learned you were HIV-negative the last time you were tested, you can only be sure you’re still negative if you haven’t had a potential HIV exposure since your last test.

How long does it take to detect HIV after exposure?

An antigen/antibody test performed by a laboratory on blood from a vein can usually detect HIV infection 18 to 45 days after an exposure. Antigen/ antibody tests done with blood from a finger prick can take longer to detect HIV (18 to 90 days after an exposure). Antibody tests can take 23 to 90 days to detect HIV infection after an exposure.

How accurate is the first response HIV card test?

The specificities of the First Response HIV Card Test 1–2.0, INSTI HIV-1/HIV-2 Antibody Test, Determine HIV-1/2 and Genie Fast HIV 1/2 were all between 90 and 95\%. The findings confirm that the diagnosis of HIV should not be based on results from a single HIV rapid diagnostic test.

How accurate is a western blot for HIV?

The results of both tests together are more than 99\% accurate. The tests used to confirm HIV infection are either the Western blot or indirect fluorescent antibody (IFA) test. If your screening test went to a laboratory, they can do this additional testing on the same blood sample.