Doctors check poop for DNA as part of the screening process for colorectal cancer. It helps doctors diagnose people with this disease during its early stages or even when the cells are precancerous.

In the last decade, the drive to understand who we are and where we've come from has been accelerated by DNA testing.

Genetic testing, often via a blood sample, can confirm a muscular dystrophy diagnosis. It can also identify specific gene mutations to help guide treatment and determine whether or not someone is a ...