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| IRA organique | IRA fonctionnelle | |
|---|---|---|
| Na urinaire (mmol/L) | > 40 | < 20 |
| Fraction d’excrétion du sodium ( %)* | > 2 | < 1 |
| Urée sanguine/créatinine sanguine | 50 (expression molaire) | > 100 (expression molaire) |
Fraction d’excrétion du sodium : clairance du sodium/clairance de la créatinine = (U/P Na+)/(U/P créatinine) × 100.
