| Cut off | Sensitivity | Specificity | PPV | NPV | Accuracy |
Creatinine | >0.23 mg/dl | 100 | 100 | 100 | 100 | 100 |
Urea | >0.41 mg/dl | 100 | 100 | 100 | 100 | 100 |
b-hCG | 20 mIU/ml | 83 | 100 | 100 | 85.6 | 91 |
AFI | ≤5 | 33.2 | 97.4 | 96.3 | 42.1 | 0.67 |