Predictors of bile duct stones
| Predictors |
| Very strong Ascending cholangitis Common bile duct stone on abdominal ultrasonography Bilirubin > 4 mg/dL |
| Strong Dilated common bile duct on abdominal ultrasonography Bilirubin 1.8–4 mg/dL |
| Moderate Age > 55 Abnormal aminotransferase and gamma-glutamyl transferase levels Gallstone pancreatitis |
| Likelihood of choledocholithiasis based on predictors |
| High (> 50%) Presence of any very strong factor Presence of 2 strong factors |
| Intermediate (10% to 50%) All other patients |
| Low (< 10%) No predictors present |
Adapted from reference 31.