Table 4.

Predictive factors and risk classes for choledocholithiasis

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

Modified from [139]