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Should i Re-test after negative results from an instant HIV test?

Question: 

hi. i had a very short (less than 30 seconds) vaginal sex with a female sex worker. i did instant hiv test after 14 weeks and the result was negative. As i'm so stressed, i'm wondering if i need to repeat the test again or it's conclusive already?

Answer: 

Hello,

Thank you for your inquiry. From what we gather from the question, you were asking about the conclusiveness of an instant HIV test. From the information given, this scenario is determined to be High risk (Evidence of transmission through these activities and is the majority of cases of transmission). Unprotected vaginal sex is considered to be a high risk activity because they involve an exchange of body fluids. In addition, a significant number of scientific studies have repeatedly associated these activities with HIV infection. This is how most infections occur.

Instant HIV tests have a window period of 4 weeks to 3 months with an accuracy of 99.6%. When tested negative, results are considered to be accurate for the window period [1]. In Canada, all laboratories use 4th Generation tests as screening tests [2]. 4th Generation tests have an accuracy of 99.9% and are considered conclusive at 6 weeks post exposure. We recommend doing a 4th Generation test for even more conclusive results.

Recommendation: Refer to Physician for HIV test. If you are continuously engaging in high risk activity there are biomedical approaches such as PrEP and PEP that help lower your risk of acquiring HIV. Refer to your physicians for further information.

Regards, AIDS Vancouver Helpline/Online, Ashley