| Stages | Aspartate aminotransferase (AST) in UI | Bilirubinemia in mg/l |
| 0 | <1.25 xN | <1.1 xN |
| 1 | 1.25 - 2.5 xN | 1.1 - 1.5 xN |
| 2 | 2.6 - 5 xN | 1.6 - 2.9 xN |
| 3 | 5.1 - 10 xN | 3.5 xN |
| 4 | >10 xN | >5 xN |