GPT and Jaundice: Approximately 1 year later, he presented with obstructive jaundice and abnormal serum biochemistry results: alkaline phosphatase, 218 U/L (normal range, 30–120 U/L); total bilirubin, 82.2 μmol/L (normal range, 0–20 μmol/L); direct bilirubin, 51.2 μmol/L (normal range 0–15 μmol/L) ; aspartate aminotransferase (AST), 177 U/L (normal range, 0–45 U/L); alanine aminotransferase (ALT), 260 U/L (normal range, 0–45 U/L); serum amylase, 37 U/L (normal range, 30–110 U/L); serum lipase, 11 U/L (normal range, 5–208 U/L), and CA 19–9, 60 U/mL (normal range, 0–37 U/mL).