maliamla
A condom came off was I was having intercourse with a person of unknown status - we realised a 2-3 minutes after this happened.

About 6 months later, I had an INSTI Rapid Test at a clinic in Ontario  my results were negative.

I still can't shake the fear that my results may not have been accurate, as I understand no biological test can be 100%. 

Should I be tested again? Can I rely on the results of this test without the the stress that I might get different results at a later date?

Thank you for your help.
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helpline-volunteer
Hello,

Thank you for your inquiry. From what we gather from the question, you are asking about the usefulness of being tested again following an negative result from an INSTI Rapid Test. 

Based on the question, the exposure event described is unprotected intercourse. This scenario is determined to be a High Risk scenario (there is evidence of transmission through these activities and are the majority of cases of transmission).  This scenario meets the three components of the transmission equation (image below). In order for HIV transmission to occur, HIV positive fluid (blood, semen, vaginal fluid, anal fluid, breastmilk) must have direct access to the bloodstream through a High, Low, or sometimes Negligible Risk activity. 

About 6 months following this high risk event, you received an INSTI Rapid Test with negative results. A Rapid Test has a window period of 4 weeks to 3 months as described by the BC Centre for Disease Control (BCCDC) which indicates the time needed after exposure for conclusive testing. The test is considered conclusive if taken 3 months post-exposure. Because you received the test 6 months following exposure, you have successfully cleared this window period. Thus, the result of your test are valid, and no further testing is required. (1)(2)

Please note that this conclusive negative result pertains only to the high-risk exposure event described in the question. If other events with a risk of HIV exposure took place thereafter, further testing would be required. 

Recommendation: No need for further HIV testing, refer to a healthcare professional for further inquiries.

Regards,

AIDS Vancouver Helpline/Online, Nancy

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1. https://www.catie.ca/en/fact-sheets/testing/hiv-testing-technologies

2. 
http://www.bccdc.ca/resource-gallery/Documents/Guidelines%20and%20Forms/Guidelines%20and%20Manuals/STI/HIVP_Site_OPS_14%20INSTI%20Test.pdf

 

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