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Table 2 Risk factors and classification of risk for CBDS (modified from Maple et al. 2010)

From: 2020 World Society of Emergency Surgery updated guidelines for the diagnosis and treatment of acute calculus cholecystitis

Very strong Evidence of CBDS stone at the abdominal ultrasound
Ascending cholangitis
Strong Common bile duct diameter > 6 mm (with gallbladder in situ)
Total serum bilirubin level > 1.8 mg/dl
Moderate Abnormal liver biochemical test other than bilirubin
Age older than 55 years
Clinical gallstone pancreatitis
Risk class for choledocolithiasis
High Presence of any very strong
Low No predictors present
Intermediate All other patients