Anonymous
Hi and thanks for the informative forum and services. A few months ago I had intercourse with several sex workers. I used condoms protection to be safe. As I am now entering a new relationship with a new partner I thought it would be smart to get checked for every STD and HIV before engaging in sexual intercourse. All STDs were negative and I did a Insti HIV test at an HIV testing checkpoint near my home. The rapid test was done by a trained HIV counsellor and I got the results in one minute which were negative. I did the test exactly 86 days since my last encounter with a sex worker. As I know absolutely nothing about testing and noticed you often refer to this rapid test I thought I would ask you, if this test can be considered final and I can go in this relationship fully reassured?
I look forward to your response!!
Warm regards
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Anonymous
Hello and thank you for contacting the AIDS Vancouver Helpline.

We understand that you are asking about the accuracy of an INSTI rapid HIV test performed at 86 days after a potential exposure to HIV

The window period of the INSTI test is estimated to be the same as, or up to one week longer than, the window period for third-generation HIV tests. Third-generation tests can detect HIV infection in 50% of people by 22 days after infection; 95% of people by 40 days after infection; and 99% of people by three months after infection. Fourth-generation HIV tests and the INSTI rapid test have a sensitivity of about 99.9%. In other words, if 1000 HIV-positive people were tested for HIV, 999 would test positive and one would incorrectly test negative. Since the vast majority of people who get tested for HIV are actually HIV negative, the chance of a negative result being false is extremely low. (1)

At 86 days you can consider this to be a final result. No further testing is required.

Regards,
AIDS Vancouver Helpline/Online, Dyson



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