This is so unlikely that UK guidelines consider a negative result three months after an exposure as being HIV negative. Can it take longer than three months for a test to work? This will depend on how recent your last exposure was.Īs part of good practice, if the exposure was less than three months ago then testing at three months after exposure is usually recommended. Food and drink do not affect the results. You do not need to fast before your test. Your test result is accurate even if you had flu or a cold or are using any medication. This includes infections, medications, most vaccinations, putting on weight, eating or drinking anything before the test, use of alcohol or recreational drugs, mouthwash or time of day. HIV antibody tests, confirmed by the second test, are not affected by other circumstances. The western blot test looks for immune responses to specific HIV proteins and is 100% accurate as a confirmatory test.Ĭan anything affect the result of my HIV test? Testing earlier needs a confirmatory test three months after the risk.Ī positive test result is routinely confirmed using a different type of test called western blot. Testing earlier, for example after four week, only detects 95% of infections. This accuracy has to be considered with the window period.įor example, 4th generation tests will pick up 99% of infections at six week. Guides HIV test accuracy, results and further testing Are HIV tests accurate? HIV test accuracy, results and further testing.HIV testing and risks of sexual transmission.
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