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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.
COVID-19 rapid antigen tests (RATs) have been widely used for diagnosis of COVID-19. The World Health Organization (WHO) COVID-19 Case Definition states that a person with a positive RAT (also known as an antigen rapid diagnostic test or Antigen-RDT) can be considered a "confirmed case of SARS-CoV-2 infection" in two ways. [10]
A rapid antigen test quickly searches for antigens, protein fragments that are found on the surface of or within a virus. Antigen tests can be analyzed within a few minutes. Antigen tests are less accurate than PCR tests. It has a low false positive rate, but a higher false negative rate.
The false positive rate (FPR) is the proportion of all negatives that still yield positive test outcomes, i.e., the conditional probability of a positive test result given an event that was not present. The false positive rate is equal to the significance level. The specificity of the test is equal to 1 minus the false positive rate.
A false positive Covid-19 test result can happen, but it’s rare, says Brian Labus, Ph.D., M.P.H., ... “The rapid tests have a sensitivity of over 99 percent, which means that false positive ...
After more than two years of evading COVID-19, I tested positive at home on a rapid antigen test during the summer of 2022. At first, the line was so faint that it didn't even show up in photos.
The false positive rate (false alarm rate) is = + [1] where F P {\displaystyle \mathrm {FP} } is the number of false positives, T N {\displaystyle \mathrm {TN} } is the number of true negatives and N = F P + T N {\displaystyle N=\mathrm {FP} +\mathrm {TN} } is the total number of ground truth negatives.
A false positive isn't as likely as a false negative result on a home test early in a person's infection, explains Sandra H. Bonat, M.D., a pediatric expert and virologist with VIP StarNetwork, a ...