SMN1 and autoimmune hepatitis: Ultimately, based on the simplified diagnostic criteria for AIH (11), the patient exhibited a positive SMA antibody (1 point), negative HBsAg in both blood and liver tissue (2 points), IgG levels greater than 1.10 times the upper normal limit (2 points), and liver histology consistent with typical AIH (2 points), resulting in a total score of 7 points.