Antigen and PCR tests diagnose COVID-19. Read about how these tests differ in their method of determining results, accuracy, timing, skill requirement, and costs.

Experts discuss what it might mean if you get a faint line on a home COVID-19 test, when to take another test and what precautions to take.

And, by the way, the rapid antigen test he took when he got home that night ... It may seem odd to talk about a test you have to buy from Europe, with an expensive reader, and a test process I just ...

COVID-19 rapid tests are easy to take—and then toss. So most people never report their results, which leaves health officials with an incomplete picture of how much virus is circulating and ...

Health officials stress that at-home tests are a vital and accurate way of tracking COVID-19 infections but an initial negative test doesn't mean people are out of the woods.

But in the case of the rapid home tests, the F.D.A. has asked for real-time data from manufacturers, which is a much longer process. Will a test that sits on the shelf still work after nine months?

Traditionally, blood typing requires forward typing, in which antibodies found in type A and type B blood are added to a blood sample to test for reactivity, followed by reverse typing, in which serum ...