Fractional Excretion of Sodium
Info
Urine Na
unit mg/dL mmol/L
Urine Cr
unit mg/dL µmol/L
Serum Na
unit mg/dL mmol/L
Serum Cr
unit mg/dL µmol/L
R e s u l t s
FENa
? ? ?
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Info
Fractional Excretion of Sodium
 

Fractional Excretion of Na (FENa) in %=

[ (urine Na) / (serum Na) ] x 100 / [ (urine Cr) / (serum Cr) ]

 

Cr in mg/dL; Na in mEq/L.

FENa < 1 - Pre-renal

FENa > 1 - Renal