Polymerase chain reaction (PCR) and rapid (antigen) tests for COVID-19 both involve taking a swab. Results for a PCR test take longer, as it needs to go to a laboratory. It is more costly but tends to ...

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Rapid tests work well on Omicron variants, but only if your viral load is high at the time. You need to reach a certain threshold before any test — PCR or rapid — can detect your infection. Experts ...

Now that COVID-19 is regularly circulating through communities, it’s hard to know if you should take a COVID test every time you have a sniffle. Gone are the days of COVID testing centers on every ...

NEW YORK -- Millions of Americans have purchased rapid COVID-19 tests online or at local stores and signed up to receive test kits through a free government program. Unlike conventional, lab-processed ...

A lot of us are thinking about how to celebrate the holidays while feeling a little more Covid-19-safe this year. Testing is one tool for that, and here’s a little how-to video on using an at-home ...

During the holidays, lots of Coloradans relied on rapid COVID-19 tests to determine whether they should gather for parties, visit with friends and family or stay home. But those tests weren’t widely ...

This article was reviewed by Darragh O’Carroll, MD. Understanding Blood Tests: How They Work and What They Can Tell You Blood ...

SYDNEY, AUSTRALIA - SEPTEMBER 29: In this photo illustration a man uses a COVID-19 rapid antigen test kit at home on September 29, 2021 in Sydney, Australia. Australians will be able to use rapid ...