Add Yahoo as a preferred source to see more of our stories on Google. For any American wondering if they have Covid-19, there are two kinds of tests available: polymerase chain reaction (PCR) and ...

Add Yahoo as a preferred source to see more of our stories on Google. By now, most of us know the basics of taking a COVID-19 test at home. With cases, test positivity and hospitalizations due to ...

Two types of COVID-19 tests, the rapid antigen test and the polymerase chain reaction (PCR) test, are available in the United States. The PCR typically relies on lab testing and is still considered ...

To quickly confirm an asymptomatic case of COVID-19, a second rapid test within an hour of a positive result can boost the accuracy of the result from 38 percent to 92 percent, according to a new ...

What does it mean if a person's rapid antigen test result comes back positive after five days of isolation due to COVID-19? According to the experts, that person is most likely still carrying a viral ...

It seems easy enough to take a COVID-19 test at home. But what if your results aren't so simple to interpret? If you get just ...

Makers of COVID-19 testing tools are raking in billions while many consumers pay through the nose to find out if they are infected. Over-the-counter rapid tests have been pricey since they first ...

NPR's Mary Louise Kelly talks with Dr. Wilbur Lam, a lead investigator assessing COVID-19 diagnostic tests for the U.S. government, about detecting the omicron BA.2 subvariant with rapid tests. The ...