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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.
A 2022 research letter published in JAMA Network showed that of more than 903,000 rapid antigen tests, 462, or 0.05%, were false positive. What to Do When You Test Positive for Covid
False positives "can happen with any test" and, if someone tests positive for COVID-19 with a rapid test but does not have symptoms, he recommends following up with a PCR test to confirm that this ...
If you have symptoms and test negative with an at-home rapid test, test again 48 hours later, the CDC advises. ... When a positive rapid antigen test goes from a dark line to a very faint line ...
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.
Even if it is faint, a positive line result on a rapid antigen COVID-19 test indicates that you are sick and likely contagious. For those who are recovering, the opaqueness of the results window ...
If your COVID-19 rapid test turns positive, but the line is faint, unfortunately it still means you have COVID. However, a re-test might be in your future.
A person may test positive because they are still shedding viable virus, or it could be viral debris that is being picked up by the test, says Amesh A. Adalja, M.D., senior scholar at the Johns ...