What's the Deal With COVID Testing Now? Doctors Explain When to Test, How to Get Them and More

A PCR test detects the actual genetic material of the virus and involves a step that amplifies the presence of any material ...

A simple blood test can detect 50 types of cancer: We explain

The Galleri test, by American company GRAIL, can detect over 50 types of cancerous DNA with a simple blood test. How the cancer screening test works.

Gut microbiome tests are everywhere. Should you get one?

At-home tests of the gut's microbiome are trending, but doctors say the technology is getting ahead of medical knowledge.

A Dietitian Says This 1 Food Test Is Bogus

In TODAY.com's Never Have I Ever series, a registered dietitian explains what to do instead of spending money on these tests.