Fractional Na⁺ Excretion - MedSchool
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The fractional excretion of sodium (FeNa) is the fraction of the sodium filtered by the kidney that is excreted in urine. The FeNa can be used to distinguish between prerenal (0.03) causes of oliguric acute kidney injury.
Serum Sodium
Urinary Sodium
Serum Creatinine
Urinary Creatinine
FeNa =
Urine Na × Serum Cr Serum Na × Urine Cr