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Zargar's grading classification of mucosal injury caused by ingestion of caustic substances
| Grade 0 | Normal examination |
| Grade 1 | edema and hypermia of the mucosa |
| Grade 2a | Superficial ulceration, erosions, friability, blisters, exudates, hemorrhages, whitish membranes |
| Grade 2b | Grade 2a plus deep discrete or circumferential ulcerations |
| Grade 3a | Small scattered areas of multiple ulceration and areas of necrosis with brown-black or greyish discoloration |
| Grade 3b | Extensive necrosis |
