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The false-positive rate for a PCR test is close to zero, though. ... Both BinaxNOW and QuickVue recommend that you take two tests at least 24 to 36 hours apart to get the most accurate results.
A false positive Covid-19 test result can happen, but it’s rare, says Brian Labus, Ph.D., M.P.H., assistant professor at the University of Nevada Las Vegas School of Public Health.
In the most basic sense, there are four possible outcomes for a COVID-19 test, whether it’s molecular PCR or rapid antigen: true positive, true negative, false positive, and false negative.
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Also in October 2021, Ellume recalled more than 2.2 million of its home tests because of "higher-than-acceptable false positive test results for SARS-CoV-2". [ 91 ] In December 2021, US president Biden announced that the government planned to purchase and distribute for free 500 million at-home COVID-19 RATs. [ 92 ]
In clinical practice, post-test probabilities are often just estimated or even guessed. This is usually acceptable in the finding of a pathognomonic sign or symptom, in which case it is almost certain that the target condition is present; or in the absence of finding a sine qua non sign or symptom, in which case it is almost certain that the target condition is absent.
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