| Grade |
Portal/periportal activity |
Lobular activity |
| 0 |
None |
None |
| 1 |
Portal inflammation |
Inflammation but no necrosis |
| 2 |
Mild piecemeal necrosis |
Focal necrosis or acidophil bodies |
| 3 |
Moderate piecemeal necrosis |
Severe focal cell damage |
| 4 |
Severe piecemeal necrosis |
Damage includes bridging necrosis |
