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Table 2 2016 WSES predictive factor for CBDS and risk class (modified from SAGE-AGES)

From: 2017 WSES and SICG guidelines on acute calcolous cholecystitis in elderly population

Predictive factor for choledocholithiasis
Very strong Evidence of CBD stone at abdominal ultrasound
Total serum bilirubin > 4 mg/dL
Strong Common bile duct diameter > 6 mm (with gallbladder in situ)
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