Table I.

Criteria for staging and grading chronic hepatitis (2000, Xi’an).

Inflammatory activity		Degree of fibrosis
Grade	Portal area and periphery	Intralobular	Stage	Fibrosis
G0	No inflammation	No inflammation	S0	None
G1	Portal area inflammation	Degeneration and a little focal necrosis	S1	Portal area expansion, fibrosis
G2	Mild piecemeal necrosis	Degeneration, spotted and focal necrosis or acidophilic body	S2	Fibrous septum is forming, and lobular structure is retained
G3	Moderate piecemeal necrosis	Degeneration, severe necrosis or visible bridging necrosis	S3	Fiber insulation with lobular disorder, without liver cirrhosis
G4	Severe piecemeal necrosis	Wide area of bridging necrosis to involve multiple lobules, lobular structure disorder	S4	Forepart hepatocirrhosis