PIgG levels were significantly higher in the AIH-group 1.9 normalised arbitrary units (nAU) compared to DILI (1.1 nAU, p < 0.001), non-AIH-non-DILI-LD (1.0 nAU, p < 0.001) and healthy controls (0.27 nAU, p < 0.001). Here, PIGG is linked to autoimmune hepatitis.