In biliary colic evaluation for possible choledocholithiasis, which tests are indicated?

In biliary colic evaluation for possible choledocholithiasis, which tests are indicated?

• A. Liver function tests including AST/ALT/ALP/GGT and bilirubin
• B. CBC only
• C. Lipase only
• D. Serum amylase

Answer: (A)

In biliary colic when choledocholithiasis is suspected, the priority is to detect obstruction and cholestasis. A liver function test panel that includes AST, ALT, alkaline phosphatase, GGT, and bilirubin is most informative because obstruction of the bile duct tends to cause a cholestatic pattern: alkaline phosphatase and GGT rise, and bilirubin (often direct/conjugated) increases when bile flow is blocked. AST and ALT may also be modestly elevated with biliary obstruction. This pattern helps identify a ductal blockage rather than a primary hepatocellular injury. A CBC is less specific for choledocholithiasis, and lipase or amylase are used when pancreatitis is suspected, not as routine tests for this condition.

In biliary colic when choledocholithiasis is suspected, the priority is to detect obstruction and cholestasis. A liver function test panel that includes AST, ALT, alkaline phosphatase, GGT, and bilirubin is most informative because obstruction of the bile duct tends to cause a cholestatic pattern: alkaline phosphatase and GGT rise, and bilirubin (often direct/conjugated) increases when bile flow is blocked. AST and ALT may also be modestly elevated with biliary obstruction. This pattern helps identify a ductal blockage rather than a primary hepatocellular injury. A CBC is less specific for choledocholithiasis, and lipase or amylase are used when pancreatitis is suspected, not as routine tests for this condition.