You swabbed the inside of your nose and performed the at-home rapid antigen test for COVID-19 and thankfully, it was negative. Hold on. Do the test again, says the U.S. Food and Drug Administration, ...

Taking a COVID-19 test at home seems simple enough: If you get a line, you're positive for the coronavirus. But what if your results aren't so obvious? For instance, if you only get a very faint line ...

After a recent COVID-19 exposure, Dr. Christina Astley tested positive on an at-home test—but just barely. The line signifying a positive result was so faint that Astley, an endocrinologist at Boston ...

It was possible -- albeit rare -- for people not infected with SARS-CoV-2 to have persistent false positive rapid antigen COVID-19 tests, longitudinal data showed. Among a large cohort of over 11,000 ...

WORCESTER – Anyone who gets a negative result for COVID-19 from an at-home rapid antigen test shouldn't assume they're not infected, and should keep testing, according to a safety recommendation ...

Every household in the United States now is eligible to order more free rapid COVID-19 test kits from the federal government. Beginning Nov. 20, households that previously ordered tests this fall ...

About 60% of healthcare workers participating in an optional rapid antigen testing program at UCLA tested positive at day five, and about 50% were positive at day seven after initially testing ...

SAN DIEGO--(BUSINESS WIRE)--Quidel Corporation (NASDAQ: QDEL) (“Quidel”), a leading provider of rapid diagnostic testing solutions, cellular-based virology assays and molecular diagnostic systems, ...

For instance, if you only get a very faint line, it might be hard to know whether or not that means your results are positive. I know how that feels firsthand. After more than two years of evading ...