A patient with jaundice has the following LFTs: Total bilirubin: 8 mg/dL (↑↑) Direct bilirubin: 6.5 mg/dL (↑↑) ALP: 450 U/L (↑↑) AST/ALT: Mildly elevated. The pattern suggests:

The patient's LFTs show markedly elevated total and direct bilirubin, indicating a predominance of conjugated hyperbilirubinemia. The significantly raised ALP suggests cholestasis or bile duct obstruction. Mild elevation of AST/ALT indicates minimal hepatocellular injury. This pattern is classic for obstructive jaundice, where bile excretion is impaired due to blockage, causing a buildup of conjugated bilirubin and increased ALP from bile duct epithelial damage. In contrast, hepatocellular jaundice would show higher AST/ALT relative to ALP, and hemolytic jaundice would feature elevated indirect bilirubin without ALP elevation.

Key surgical point: Obstructive jaundice often requires imaging and potentially surgical or endoscopic intervention to relieve the obstruction.

Reference: Harrison's Principles of Internal Medicine, Kasper et al., 20th Edition.