| Score | |
| Clinical criteria | |
| Stool frequency | |
| Usual post-op stool frequency | 0 |
| One to two stools/day > post-op usual | 1 |
| Three or more stools/day > post-op usual | 2 |
| Rectal bleeding | |
| None or rare | 0 |
| Present daily | 1 |
| Fecal urgency/abdominal cramps | |
| None | 0 |
| Occasional | 1 |
| Usual | 2 |
| Fever (temperature >100°F) | |
| Absent | 0 |
| Present | 1 |
| Endoscopic criteria | |
| Edema | 1 |
| Granularity | 1 |
| Friability | 1 |
| Loss of vascular pattern | 1 |
| Mucus exudate | 1 |
| Ulceration | 1 |
| Acute histologic criteria | |
| Polymorph infiltration | |
| Mild | 1 |
| Moderate + crypt abscess | 2 |
| Severe + crypt abscess | 3 |
| Ulceration per low-power field (average) | |
| <25 percent | 1 |
| ≥25 to ≤50 percent | 2 |
| >50 percent | 3 |
