Normal preoperative levels of gamma-glutamyltransferase predict the absence of common bile duct stones in patients scheduled for laparoscopic cholecystectomy: a retrospective cohort study.

Based on the provided information, it is concluded that GGT plays an important role in predicting the coexistence of choledocholithiasis in symptomatic cholelithiasis and can be used in the setting where the facility of per-operative cholangiogram is not available.