Scoring system for drug induced mucosal damage29
| Grades 0–2, clinically insignificant; grades 3–4, clinically significant. | |
| Grade 0 | No visible injury |
| Grade 1 | <10 (petechial) haemorrhages with no erosions |
| Grade 2 | 10–25 haemorrhages and/or 1–5 erosions |
| Grade 3 | >25 haemorrhages and/or 6–10 erosions |
| Grade 4 | >10 erosions and/or ulcer |