Excreted Fraction of Sodium

 

 

 
Serum
Urine
Sodium (mMol/L)
Creatinine (mg/dL)

 

EFNa
%
RFI
%
Creat Urine/Plasma
Interpretation :      
 
Pre
ATN
Post
Una (mMol/L)
<20
>40
>40
FEna (%)
<1
>1
>4
RFI (%)
<1
>1
>1
Osm Urine (mOsm/kg)
>450
<350
Osm Urine/Plasma
>1.5
<1.1
Creat Urine/Plasma
>30
<20