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Sensitivity and specificity of the direct parameters
| Parameter | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) |
| RPSV > 200 cm/s | 97 | 72 | 81 | 95 |
| RAR > 3 | 77 | 90 | 90 | 76 |
| RRR > 2.7 | 97 | 96 | 97 | 97 |
RPSV: renal peak systolic velocity; RAR: renal/aortic ratio; RRR: renal-renal ratio PPV: positive predictive value; NPV: negative predictive value
