GPT and myotonic dystrophy type 1: Conversely, serum GPT (43.94 ± 26.45 vs. 30.92 ± 20.46 UI/L) and γGT (103.23 ± 89.71 vs. 67.20 ± 115.08 UI/L) levels were both significantly higher in DM1 males vs. females, and γGT also resulted in being more frequently pathologically increased (80 vs. 44%).