Talking about home testing for HIV

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False negative

Did 4 tests at 6, 10.5, 12.5 and 15.5 weeks all negative. What are the chances the last 2 were false negatives?

2 Responses

 Used on 19th November 2018

Hi Simple probability, combining all 4 results. The tests before 12 weeks are 95% and the two after 99.9% So works out (1/1000)^2 x (1/20)^2= 1/40,000,000 so 1 in 40 Million. Safe to say the tests are conclusive. If you wanna do one more it will take you to 1 in 40 Billion !!!!!!

Francesca Bard, BioSure (UK) Ltd
 Work on 22nd October 2018

Hi Abcd. The chances of getting 1 false negative is virtually impossible let alone 2. I think that for some people accepting a negative result is just as difficult as accepting a positive test result. In order to put your mind at rest I would recommend accepting your HIV negative status and unless you have another potential exposure I would also recommend against re-testing as this will only prolong your acceptance period. Kindest regards Francesca Bard, BioSure (UK) Ltd

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