Talking about home testing for HIV

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Testing window period

Hello doctors
I took three tests at 28,29 and 31 days – I was wondering what percentage of people have positive results by then? Is it over 50 percent?? I had an illness starting at 2 weeks after low risk exposure and have taken your tests at 28,29 and 31 days post exposure. I assume that based on 90 percent chance of positive result at 5 weeks that the odds are in my favour based on my 4.5 week test?
I was also told online that antibody tests are usually always positive by two weeks after illness if related to hiv. Not sure how true this is.
Kind regards

5 Responses

Gary Carpenter, BioSure (UK) Limited
 Work on 22nd August 2017

Hi FloydRose1 Thanks for your question. At 108 days post exposure you can consider a negative test to be conclusive. I would not recommend the need for additional testing. Condom use is an excellent preventative measure against the transmission of HIV. I hope that this answers your question. Kind regards Gary Carpenter BioSure (UK) Limited

 Used on 21st August 2017

Hello, I have had a test 108 days (15.4 weeks) after exposure (i also used a condom). The test came back negative (one line on the test). Should i accept this result or is more testing needed?

 Used on 22nd April 2017

Dear Doctor To keep you updated I did another test at 5 weeks (35 days) and this was also negative so based on this being three weeks after onset of symptoms and 90 percent probability it appears very unlikely I am infected. Kind regards

 Used on 18th April 2017

Thanks for quick response doctor. I assume I am ok then as symptoms started at 14 days post exposure and had negative biosure tests more than two weeks after. However I will retest at the 12 week mark as suggested to be sure. Kind regards

Gary Carpenter, BioSure (UK) Limited
 Work on 18th April 2017

Hi Tony Thanks for getting in contact. You are right about seroconversion illness and the time to test. An antibody test will always be positive 2 weeks after the onset of seroconversion illness. By 31 days we estimate that at least 80% of people would have created enough antibodies for the BioSURE HIV Self Test to be positive. So your series of negative test results are extremely encouraging. To be absolutely certain that you can put this behind you we would advise another test at around the 12 week mark post exposure. To reiterate this is just to be absolutely certain. I hope that this answers your question. Kind regards Gary Carpenter BioSure (UK) Limited

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