Features/parameter

Discriminator

score

ANA or SMA+

≥1:40

+1*

ANA or SMA+

≥1:80

+2

or LKM+

≥1:40

+2

Or SLA/LP+

Any titer

+2

IgG or gamma-globulin level

>upper limit of normal

+1

>1.1 upper limit

+2

Liver histology (evidence of hepatitis )

Compatible with AIH

+1

Typical of AIH

+2

Atypical

0

Absence of hepatitis

No

0

Yes

+2