Diagnostic Performance of Fractional Excretion of Urea and Fractional Excretion of Sodium in the Evaluations of Patients With Acute Kidney Injury With or Without Diuretic Treatment

In patients without diuretic use, FENa is better able to distinguish transient from persistent AKI. In patients administered diuretics, this distinction cannot be made accurately by means of FENa. FEur cannot be used as an alternative tool because it lacks specificity.