. Author manuscript; available in PMC: 2017 May 1.

Published in final edited form as: Clin Liver Dis. 2015 Dec 28;20(2):293–312. doi: 10.1016/j.cld.2015.10.011

Table 3. The SAF Diagnostic Algorithm for Defining NASH.

Steatosis (S)	Lobular Inflammation	Ballooning	Total Activity Score (A)	Diagnosis
0	0, 1 or 2	0, 1 or 2	0 to 4	Not NAFLD
1, 2 or 3	0	0	0	NAFL
		1	1	NAFL
		2	2	NAFL
	1	0	1	NAFL
		1	2	NASH
		2	3	NASH
	2	0	2	NAFL
		1	3	NASH
		2	4	NASH