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Table 4 Predictive factors and risk classes for choledocholithiasis

From: 2016 WSES guidelines on acute calculous cholecystitis

Predictive factor for choledocholithiasis
 Very strong Evidence of common bile duct stone at abdominal ultrasound
 Strong Common Bile duct diameter > 6 mm (with gallbladder in situ)
Total Serum Bilirubin > 4 mg/dL
Bilirubin level 1.8 to 4 mg/dL
 Moderate Abnormal liver biochemical test other than bilirubin
Age older than 55 years
Clinical gallstone pancreatitis
Risk class for choledocholithiasis
 High Presence of any VERY STRONG
 Low No predictors present
 Intermediate All other patients
  1. Modified from [139]