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  • When is hiv detectable after exposure

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    • Maximum window period for hiv!

    What is the window period for an HIV test?

    Next page: Where can I test for HIV in the UK?

    What is the window period?

    The window period is time between HIV infection and the point when a test will give an accurate result for a certain percentage of samples.

    Different types of tests have different window periods.

    • 4th generation antibody/antigen (Ab/Ag) tests: 45 days to detect 99% of samples.
    • 3rd generation antibody only tests: 60 daysto detect 99% of samples.
    • Point of care tests (self-sampling, self-testing and rapid tests: 90 days to detect 99% of samples.

    During the window period, someone can be very infectious but still test HIV negative.

    UK guidelines recommend a window period of six weeks for a 4th generation antigen/antibody test (BHIVA/BASHH 2020).

    By this time 99% of infections will be detected (see Figure 7).

    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.

    A negative result from testing earlier, for example after four weeks, does need to be conf

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