The Mayo Clinic score for grading the activity of ulcerative colitis

Assessment

Points

Stool frequency

Patient reporting a normal number of daily stools

0

1-2 more stools than normal

1

3-4 more stools than normal

2

≥5 more stools than normal

3

Rectal bleeding

None

0

Blood streaks seen with stool less than half of the time

1

Blood with most stools

2

Pure blood passed

3

Endoscopic findings

Normal or inactive colitis

0

Mild friability, erythema, decreased vascularity

1

Friability, marked erythema, absent vascular pattern, erosions

2

Ulcerations and spontaneous bleeding

3

Physician’s global assessment

Normal

0

Mild colitis

1

Moderate colitis

2

Severe colitis

3

Higher scores are correlated with more severe ulcerative colitis.

Source: Schroeder KW, Tremaine WJ, Ilstrup DM. Coated oral 5-aminosalicylic acid therapy for mildly to moderately active ulcerative colitis. A randomized study. N Engl J Med. 1987 Dec 24;317(26):1625-9. PubMed PMID: 3317057.