Nonalcoholic fatty liver disease activity score (NAS)

Feature	Points	Criteria
A. Steatosis	0	<5%
	1	5 to 33%
	2	>33 to 66%
	3	>66%
B. Lobular inflammation	0	None
	1	<2 foci per 200X field
	2	2 to 4 foci per 200X field
	3	>4 foci per 200X field
C. Ballooning	0	None
	1	Few ballooning cells
	2	Many cells/prominent ballooning

Graphic 98135 Version 1.0

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