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 ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Rapid tests are inexpensive, easy to use and give fast results, usually within 10 to 15 minutes. Violeta Stoimenova/E+ via Getty ...

Rapid at-home covid tests are flying off store shelves across the nation and are largely sold out online as the delta variant complicates a return to school, work and travel routines. But at $10 or ...

Facing long lines and shortages of home test kits during the latest surge, people are searching for answers about Covid tests. By Tara Parker-Pope Dani Blum and Nicole Stock Testing is essential to ...