Laboratory Abnormalities in Gallbladder Disease

Primary Laboratory Abnormalities

The American College of Radiology recommends that the cholestatic pattern (elevated ALP and GGT) is the hallmark of biliary obstruction from gallbladder disease, particularly when stones migrate to the common bile duct 1, 2
ALP elevation occurs in cholestatic liver disease from biliary outflow obstruction, as noted by the American College of Radiology 1
Choledocholithiasis typically elevates ALP, according to the American College of Radiology 2

GGT is the most reliable marker for confirming hepatic origin of ALP elevation, as stated by the World Journal of Emergency Surgery and the American College of Radiology 4, 3, 2
In acute cholecystitis with common bile duct stones, GGT showed 80.6% sensitivity and 75.3% specificity at a cut-off of 224 IU/L, according to the World Journal of Emergency Surgery 4

Bilirubin at cut-off >22.23 μmol/L had 84% sensitivity and 91% specificity for common bile duct stones, as reported by the World Journal of Emergency Surgery 4
Bilirubin >2× normal limit had only 42% sensitivity but 97% specificity, according to the World Journal of Emergency Surgery 4
Elevated conjugated bilirubin may occur in advanced disease or with biliary obstruction, as noted by Hepatology 5

When ALP and GGT are predominantly elevated (cholestatic pattern), first-line imaging should be transabdominal ultrasound to assess for ductal dilatation and stones, as recommended by the American College of Radiology and the Journal of the American College of Radiology 2, 3
If ultrasound shows common bile duct stones, proceed directly to ERCP, according to the American College of Radiology and the Journal of the American College of Radiology 2, 3

Timing matters: Obtain liver function tests during clinical stability, as transient elevations occur during systemic inflammation or antibiotic treatment, as noted by Hepatology 5
Age and sex-normative values must be used rather than fixed thresholds, according to Hepatology 5
Platelet count should be checked, as portal hypertension from advanced disease may cause thrombocytopenia, as reported by Hepatology 5