You see, those over-the-counter antigen tests are capturing whether COVID-19 is present at that "exact" moment you take the test. It doesn't tell you if you have COVID-19.

we agreed he would take a COVID test using one of my rapid home PCR tests. It was a courtesy—he felt perfectly fine— but he tested positive. By the next day, he was sick as a dog. And, by the way, the ...

At-home COVID-19 tests have become commonplace for many households, but knowing when exactly to take a rapid test — or when to throw old ones out — isn't always straightforward. Here's what ...

Another limitation to rapid antigen tests is that currently they are designed to test only for COVID-19, influenza A and influenza B. Currently available over-the-counter tests aren’t able to ...

What is the at-home COVID and flu test called? The test, called the Healgen Rapid Check COVID-19/Flu A&B Antigen Test, screens for Influenza A and B viruses, which cause flu each season, as well ...

To determine whether your COVID test is still usable, you can check the at-home COVID-19 tests listed on the FDA's website to see which brands have had their shelf lives extended.

A rapid antigen test uses laboratory-produced antibodies to seek out and latch onto proteins on the surface of SARS-CoV-2 particles in the sample.

To detect these antigens, rapid tests have paper-like strips coated with specially engineered antibodies that function like a molecular Velcro, sticking only to a specific antigen.

Antigen versus antibody testing for COVID-19: What you need to know The FDA has issued emergency authorizations to 12 antibody tests for the virus.

Using an over-the-counter antigen test to find out if you have COVID-19 is helpful, if you use it correctly and repeatedly.