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Resultant SUMIHDEHD‘‘ score from intrahepatic (IHD) and extrahepatic (EHD) disease. The score can be read from the intersection of the pertaining EHD row and IHD column (the combination 0–0 is non-existent because it would preclude a diagnosis of primary sclerosing cholangitis)
| IHD | ||||
| 0 | I | II | III | |
| EHD | ||||
| 0 | — | 2 | 3 | 3 |
| I | 1 | 2 | 3 | 3 |
| II | 2 | 3 | 3 | 4 |
| III | 3 | 3 | 4 | 5 |
| IV | 3 | 3 | 4 | 5 |
