Regarding laboratory tests, γGT levels were pathologically increased (mean value 88.22 ± 101.71 UI/L) in 65% of DM1 patients, alkaline phosphatase (mean 80.81 ± 31.66 UI/L) in 19.7% of DM1 patients, and GPT in 29.82% of the patients; amylase was out of normal range in only 3 patients. Here, GPT is linked to myotonic dystrophy type 1.