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Non-alcoholic steatosis or non-alcoholic fatty liver disease activity score is determined by evaluating the steatotic and inflammatory activity
| NAS | Steatosis | Ballooning | Inflammation, lobular |
| 0 | < 5% (0) | None (0) | None (0) |
| 3 | 5%-33% (1) | Rare or few (1) | 1–2 foci per 20 × field (1) |
| 6 | 34%-66% (2) | Many (2) | 2–4 foci/20 × field (2) |
| 8 | > 66% (3) | Many (2) | > 4 foci/20 × field (3) |
NAS: Non-alcoholic steatosis.
