KidneyFitness: Fractional Excretion of Sodium & Transtubular Potassium Excretion

Fractional Excretion of Sodium (FENa)

Sodium

Serum (P_Na):

mmol/L

Urine (U_Na):

mmol/L

Creatinine

Serum (P_Cr):

mmol/L

Urine (U_Cr):

mmol/L

Fractional Excretion of Sodium (FE_Na) =

Renal Failure Index (RFI) =

Fractional Excretion of Sodium (FE_Na) = (U_Na x P_Cr) / (P_Na x U_Cr) x 100

Renal Failure Index (RFI) = (U_Na x P_Cr) / U_Cr

Transtubular Potassium Gradient (TTKG)

Potassium

Serum (P_K):

mmol/L

Urine (U_k):

mmol/L

Osmolality

Serum (P_Osm):

mmol/L

Urine (U_Osm):

mmol/L

Transtubular Potassium Gradient (TTKG) =

Transtubular Potassium Gradient (TTKG) = (U_K x P_osm) / (P_K x U_osm)

DISCLAIMER: All calculations must be confirmed before use. The authors make no claims of the accuracy of the information contained herein; and these suggested doses are not a substitute for clinical judgement. Neither KidneyFitness.com nor any other party involved in the preparation or publication of this site shall be liable for any special, consequential, or exemplary damages resulting in whole or part from any user's use of or reliance upon this material.

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Fractional Excretion of Sodium & Transtubular Potassium Excretion

Fractional Excretion of Sodium (FENa)

Transtubular Potassium Gradient (TTKG)