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. 2016 Dec 20;11(12):e0167243. doi: 10.1371/journal.pone.0167243

Table 2. The Bristol Stool Form Scale.

Type Description
1 Separate hard lumps like nuts (difficult to pass)
2 Sausage shaped but lumpy
3 Like a sausage but with cracks on its surface
4 Like a sausage or snake, smooth and soft
5 Soft blobs with clear-cut edges (passed easily)
6 Fluffy pieces with ragged edges, a mushy stool
7 Watery, no solid pieces, entirely liquid