Preoperative liver function tests showed slightly higher transaminases in patients without T2D (AST 45 U/l (27–65) vs. 28 U/l (20–59); p = 0.027 and ALT 44 U/l (31–61) vs. 33 U/l (19–52); p = 0.003) while all other liver and renal retention parameters were comparable. Here, GPT is linked to type 2 diabetes mellitus.