Sleep and gut health

Bristol stool scale

Also called Bristol stool chart, Bristol scale

The Bristol stool scale is a seven-type chart of stool form, from separate hard lumps (type 1) to entirely liquid (type 7).

Types 3 and 4 are the usual middle. It was developed in Bristol in the 1990s and is used to describe bowel habits clearly and to estimate how fast food moves through the gut.

General information, not medical advice.