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 Heaton at the University of Bristol
and was first published in the Scandinavian Journal of Gastroenterology in 1997)
- form of the stool depends on the time it spends in the colon
- Types 1 and 2 indicate constipation, with 3 and 4 being the "ideal stools"
especially the latter, as they are the easiest to pass, and 5-7 being
further tending towards diarrhoea or urgency.