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Potential for False Positive Results with SARS-CoV-2 Antigen Tests [Internet]. . There have also been well-publicised stories of children faking a positive LFT result using the acidic properties of soft drinks. The letter reminds practitioners that: As disease prevalence decreases, the percent of test results that are false positives increase., CDCs most recent (March 2021) guidance does, however, still recommend widespread screening, which necessarily includes testing of mostly asymptomatics, despite the widely known issues regarding such policies. Epub 2021 Apr 21. UK pupils use orange juice to fake 'positive' Covid test results Follow our Covid live blog for all the latest updates. This articleoriginally appearedon The Conversation, and is republished under a Creative Commons licence. The tests, which are a key part of Downing Street's Plan B, have become a staple part of the daily. Make sure you don't leave it for longer than this as it could be inaccurate. These are pretty harsh conditions for antibodies, which have evolved to work largely within the bloodstream, with its almost neutral pH of about 7.4. 14. An investigation has been launched into the growing numbers of people who report they are testing positive for COVID on multiple lateral flow tests - but then negative on PCR tests. 7. Covid test: The drinks that could lead to a false positive result COVID rapid antigen tests can return false negatives, but experts say Covid test: Certain drinks could lead to a false positive result, according to a new study (Image: GETTY) The researchers explained the science behind the effect, saying it could be due to. food or drink, or some other very weak contaminant that is causing a false positive). When it comes to detecting the bug in adults, previous studies have shown that the tests are over80 per cent effectiveat detecting any levels of the virus.