GPT and gallstones: The optimal method for detection of microlithiasis or biliary sludge is yet to be determined, and trans-abdominal ultrasound has a significant false negative rate.1 When examining liver function tests in inpatients with pancreatitis, an alanine transaminase (ALT) level of greater than 150 IU/L is regarded as the best serum indicator of gallstones as the aetiology.8