Fractional excretion of Sodium <1% is consistent with pre-renal causes of acute kidney injury.
Urine Sodium range is 5-500 mmol/L
Plasma Sodium range is 90-180 mmol/L
Urine Creatinine range is 0-50 mmol/L
Plasma Creatinine range is 0-1100 umol/L
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Fractional Excretion Of Sodium
FENA (%) = (Urine sodium (mmol/L) / Plasma sodium (mmol/L) / (1000 x Urine creatinine (mmol/L) / Plasma creatinine (umol/L))