Ulcerative Colitis Endoscopic Index of Severity (UCEIS)35
| Descriptor (score most severe lesions) | Likert scale | Definition |
| Vascular pattern* | Normal (1) | Normal vascular pattern with arborisation of capillaries clearly defined, or with blurring or patchy loss of capillary margins |
| Patchy obliteration (2) | Patchy obliteration of vascular pattern | |
| Obliterated (3) | Complete obliteration of vascular pattern | |
| Bleeding* | None (1) | No visible blood |
| Mucosal (2) | Some spots or streaks of coagulated blood on the surface of the mucosa ahead of the scope, that can be washed away | |
| Luminal mild (3) | Some free liquid blood in the lumen | |
| Luminal moderate or severe (4) | Frank blood in the lumen ahead of endoscope or visible oozing from mucosa after washing intraluminal blood, or visible oozing from a haemorrhagic mucosa | |
| Erosions and ulcers* | None (1) | Normal mucosa, no visible erosions or ulcers |
| Erosions (2) | Tiny (≤5 mm) defects in the mucosa, of a white or yellow colour with a flat edge | |
| Superficial ulcer (3) | Larger (>5 mm) defects in the mucosa, which are discrete fibrin-covered ulcers when compared with erosions, but remain superficial | |
| Deep ulcer (4) | Deeper excavated defects in the mucosa, with a slightly raised edge |
UCEIS score=sum of all three descriptors in the worst affected area of the colon visible at endoscopy.
Remission, score ≤1.
*These three features account for 90% of variability in assessment of severity.