Truelove and Witts severity index for Ulcerative Colitis
| – | Mild | Moderate | Severe |
| Bowel movements (number per day) | Fewer than 4 | 4–6 | 6 or more plus at least 1 of the features of systemic upset (marked with * below) |
| Blood in stools | No more than small amounts of blood | Between mild and severe | Visible blood |
| Fever | No | No | Yes |
| Pulse rate greater than 90 bpm * | No | No | Yes |
| Anaemia * | No | No | Yes |
| Erythrocyte sedimentation rate (mm/hour) * | 30 or below | 30 or below | Above 30 |
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