From Wikipedia, the free encyclopedia - View original article
The Bristol stool scale or Bristol stool chart is a medical aid designed to classify the form of human faeces into seven categories. Sometimes referred to in the UK as the "Meyers scale", it was developed by Dr. Ken Heaton at the University of Bristol and was first published in the Scandinavian Journal of Gastroenterology in 1997. The authors of that paper concluded that the form of the stool is a useful surrogate measure of colon transit time. That conclusion has since been challenged as having limited validity, and only in types 1 and 2 when the subject is not constipated. However, it remains in use as a research tool to evaluate the effectiveness of treatments for various diseases of the bowel, as well as a clinical communication aid.
The seven types of stool are:
Types 1–2 indicate constipation, with 3 and 4 being the ideal stools (especially the latter), as they are easy to defecate while not containing any excess liquid, and 5, 6 and 7 tending towards diarrhoea.
Assessment of fecal morphology using only the Bristol scale can miss important diagnostic markers of digestive health, and if used on its own, it can mislead in cases of keriorrhea, rectal bleeding, mucus in the rectum, problems in bile or ingestion of waxy esters, etc.