The test is positive when either of them is detected.

Lab-based tests still outperform at-site, point-of.

. If you took it 28 days or more past the event and it was negative, it is conclusive.

Next test ask for the paper work.

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. . Created for people with ongoing healthcare needs but benefits everyone.

Jul 16, 2014 · For third-generation tests the cumulative probability of a false-negative HIV test result was 5%, 1% and 0% post-exposure, respectively, and for fourth-generation tests the corresponding intervals.

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Antibody-only tests take about two weeks longer to get these results. Fourth-generation laboratory tests are extremely accurate.

The p24 Ag is detectable as early as 14 days after exposure.

The fourth-generation test looks not only for antibodies formed against HIV-1 and HIV-2 but also for the p24 Ag, allowing for earlier detection of HIV after exposure.

If the test is done early in the window period and the result is negative, there’s a chance that a follow-up test may be positive. HIV Tests for Screening and Diagnosis.

In general, current HIV tests are highly accurate. Three weeks are well sufficient to detect hiv infection if you are testing using 4th generation hiv Ag Ab combo test.

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Infectious Disease 55 years experience.
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Fourth-generation combined antigen/antibody tests are capable of detecting both p24 antigen and antibodies against HIV-1 and HIV-2.

This accuracy has to be. 5 1/2 weeks probably is close enough. .

. 9 percent accuracy rate. HIV test accuracy depends on several factors, though, including: the type of test. . . .

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In general, current HIV tests are highly accurate. This is because 4th generation HIV tests (antigen/antibody) will detect 99% of infections at 6 weeks – compared to 95% of infections 4 weeks after exposure.

Answer (1 of 7): The main difference between fourth and fifth generation screening testing is fourth can detect but not differentiate between HIV 1/2.

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While these tests may be able to detect antibodies to the virus in as little as 23 daysTrusted Source, it could take up to 90 days to get an Jul 16, 2014 · For third-generation tests the cumulative probability of a false-negative HIV test result was 5%, 1% and 0% post-exposure, respectively, and for fourth-generation tests the corresponding intervals.