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HIV tests during the window period

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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HIV tests during the window period

British Association for Sexual Health and HIV (BASHH)/ /Expert Advisory Group on AIDS (EAGA) statement on HIV window period:

  • accredited diagnostic laboratories in the UK use "fourth generation " tests for HIV. These test for HIV antibodies and p24 antigen simultaneously in venous samples, and will detect the great majority of individuals who have been infected with HIV at 4 weeks after exposure

  • patients attending for HIV testing who identify a specific risk occurring less than 4 weeks previously should not be made to wait before HIV testing as doing so may miss an opportunity to diagnose HIV (in particular acute HIV infection during which a person is highly infectious). They should be offered a laboratory "fourth generation " HIV test on a venous sample and be advised to repeat it when 4 weeks have elapsed from the time of the last exposure

  • a negative result on a fourth generation test performed at 4 weeks post-exposure is highly likely to exclude HIV infection. A further test at 8 weeks need only be considered following an event assessed as carrying a high risk of infection

  • patients at ongoing risk of HIV infection should be advised to retest at regular intervals

  • patients should be advised to have tests for other sexually transmitted infections in line with advice on window periods for those infections (1)

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