Fractional Electrolyte Excretion (FE)

LABOKLIN Service ID: 2278

  • The FE of Na, K, P, Cl are examined.
  • If the electrolyte excretion is put into relation with the creatinine excretion (here GFR = excretion), it indicates the FE of the electrolyte.
  • The FE is used to diagnose a dysfunction of the renal tubules. In horses with healthy kidneys, the net excretion of an electrolyte in the urine is regulated by the glomerular filtration rate and the tubular reabsorption. If tubular reabsorption fails, the FE of one or more electrolytes usually increases and its FE values will be above the normal range.


urine 0.5 ml + serum (non-haemolysed) 0.5 ml, samples collected at the same time




1 day