The Los Angeles Classification System for the endoscopic assessment of oesophagitis
| Grade | Definition |
|---|---|
| A | One or more mucosal breaks no longer than 5 mm, none of which extends between the tops of the mucosal folds |
| B | One or more mucosal breaks more than 5 mm long, none of which extends between the tops of two mucosal folds |
| C | Mucosal breaks that extend between the tops of two or more mucosal folds, but which involve less than 75% of the oesophageal circumference |
| D | Mucosal breaks which involve at least 75% of the oesophageal circumference |
This is the agreed final version of the classification.8 Note that the definition of grades C and D differs slightly from the published proposed Los Angeles classification.7