Medically reviewed by Robert Burakoff, MD The Bristol Stool Chart is a diagnostic tool that evaluates your stool (poop). It ...

A test for fecal occult blood looks for blood in your poop, or feces. It can be a sign of a problem in your digestive system, such as a growth, or polyp, or cancer in the colon or rectum.

The Bristol Stool Chart describes seven classes of poo. Yours should be a 3 or 4, like a long soft log that’s got the texture of ice cream. It should smell bad — but not that bad. Poop smells ...