Bristol Stool Scale
The Bristol Stool Scale or Bristol Stool Chart is
a medical aid designed to classify the faeces form into seven groups.
It was developed by Heaton and Lewis at the University of Bristol
and was first published in the journal Scand J Gastroenterol in
1997. Because the form of the stool depends on the time it spends
in the colon, there is a correlation between the colonic transit
time and the stool type. The seven types of stool are:
Type 1: Separate hard lumps, like nuts (hard to
Type 2: Sausage-shaped, but lumpy
Type 3: Like a sausage but with cracks on its surface
Type 4: Like a sausage or snake, smooth and soft
Type 5: Soft blobs with clear cut edges (passed easily)
Type 6: Fluffy pieces with ragged edges, a mushy stool
Type 7: Watery, no solid pieces (entirely liquid)
Types 1 and 2 indicate constipation, with 3 and 4 being the "ideal
stools" especially the latter, as they are the easiest to pass.
5-7 being further tending towards diarrhea.
(From Wikipedia. http://en.wikipedia.org/wiki/Bristol_Stool_Scale)