Bristol Stool Scale

Overview
The Bristol Stool Form Scale or Bristol Stool Chart is a classification of the form, that is appearance in a toilet, of human feces into seven groups. It was developed by Dr. K. Hering at the University of Bristol and was first published in the British Medical Journal in 1990. The form of the stool depends on the time it spends in the colon.

Chart contents
Types 1 and 2 indicate constipation, types 3 and 4 are usually the most comfortable to pass, types 5-6 tend to be associated with urgency and type 7 is diarrhea.