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Colon macroscopic scoring system
| Score | Criteria |
| 0 | No damage |
| 1 | Hyperemia |
| 2 | Hyperemia and thickening without ulceration |
| 3 | Ulceration at a single site |
| 4 | Two or more sites of ulceration or inflammation |
| 5 | Ulceration or inflammation extending > 1 cm along the length of colon |
| 6-10 | Damage covering > 2 cm along the lenght of colon, with the score being increased by 1 for each additional centimeter of involvement |
