Table 3 Sensitivity, specificity, positive and negative predictive values (PPVs and NPVs, respectively) of laboratory findings and choledocal diameter on preoperative US
Laboratory and ultrasound findings | Sensitivity | Specificity | PPV | NPV |
|---|---|---|---|---|
AST/ALT | 28.6% | 94.8% | 12% | 94% |
ALP | 85.7% | 17.5% | 7% | 94% |
Total serum bilirubin | 14.3% | 93.8% | 6% | 93% |
Choledocal diameter | 14.3% | 95.9% | 20% | 94% |