SMN1 and autoimmune hepatitis: There are diagnostic criteria and a scoring system proposed by the International Autoimmune Hepatitis Group (IAIHG), since 1993. The IAIHG scoring system looks at whether specific criteria are present such as ANA and AIH-specific autoantibodies (such as SMA, LKM, and SLA/LP), as well as their titer level (the higher the titer, the greater the score), and the level of IgG.