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Grading NAFLD activity score (NAS) [47].
| Steatosis | Ballooning | Lobular Inflammation | NAS |
|---|---|---|---|
| <5% (0) | None (0) | None (0) | 0 |
| 5–33% (1) | Rare or few (1) | 1–2 foci per 20 × field (1) | 3 |
| 34–66% (2) | Many (2) | 2–4 foci/20 × field (2) | 6 |
| >66% (3) | Many (2) | >4 foci/20 × field (3) | 8 |
