American Association for the Surgery of Trauma grading system for acute appendicitis10
| Grade 1 | Inflamed without perforation. |
| Grade 2 | Gangrenous without perforation. |
| Grade 3 | Local inflammation without abscess or phlegmon. |
| Grade 4 | Localized abscess or phlegmon. |
| Grade 5 | Gross purulence and contamination. |