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 ...

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 ...

Gone are the days of visiting a doctor’s office to determine whether you have Covid. Instead, you can buy over-the-counter test kits, which diagnose infection from the comfort of your home, making ...

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As Covid cases rise, at-home tests are a critical tool to keep yourself and others safe. Here are answers to a few common questions about when and how to use them. By Dani Blum Since the public health ...

Whether you’re testing before heading back to work or want to check your own Covid status before traveling or heading to an event, there are a number of good rapid Covid tests that you can buy online ...

A rapid experimental genetic test can help guide the hands of surgeons as they delicately remove tumors from patients with brain cancer, new research suggests. The test can measure the level of cancer ...

Editor's note, March 7, 2023: The recommendations in this article are out of date and will not be updated going forward. Should you feel sick, we recommend talking to a health care professional.

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 ...

Giorgia Guglielmi is a science journalist in Basel, Switzerland. As the number of UK coronavirus cases surged in early 2021, the government announced a potential game-changer in the fight against ...