Talking about home testing for HIV

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Possible reasons for a false negative?

Hi there,

In some of the responses on here it says that ‘usually’ false negatives only occur due to testing inside the window period and taking PEP and PrEP. Outside of these reasons are there any others that may result in a false negative?

If someone takes a Biosure test well outside the window period and did not take medication that may interfere with the result can they be confident it’s conclusively negative?


3 Responses

Becky, BioSure UK LTD
 Work on 15th March 2021

Hi Deano48, the BioSURE HIV Self Test has a built in sample control line which essentially means that the control line will only show if enough blood and buffer solution has been supplied to the test. Without the presence of the control line, it is very clear to the end user that the test result is invalid. No lines = invalid test result. Kindest regards, Becky

 Used on 15th March 2021

That's helpful, thank you. I appreciate how busy you all are. Is there any way the test could not have worked/be faulty and still produce a control line? Thanks

Becky Smith, BioSure UK LTD
 Work on 15th March 2021

Hi Deano48, If someone receives a negative result outside of the 12 week window period and is not on PEP or PrEP that could interfere with the result of the test then yes, the negative result can be relied upon greatly and the user would not need to retest. This trusted source has some more information regarding false negative HIV test results: . Just be careful what you read on the internet, make sure it is from a trusted source. I hope this helps to answer your query and ease some worries you may have. However, if you have any other queries feel free to leave them below. Thank you. Kindest regards, Becky

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