Fractional urea excretion

The fractional urea excretion (FE _urea ) is a characteristic value of the kidney function and indicates what proportion of the glomerularly filtered urea is actually excreted.

${\displaystyle FE_{Urea}={U_{Urea}\times P_{Krea} \over P_{Urea}\times U_{Krea}}}$

U _Urea : urea-urea

P _Urea : plasma urea

U _Krea : urinary creatinine

P _Krea : plasma creatinine

Use in the context of the differential diagnosis of acute kidney failure , especially after the use of diuretics , as this affects the usability of fractional sodium excretion :

FE urea <35%:	prerenal kidney failure (retention of urea)
FE urea > 35%:	renal kidney failure (decreased ability of the kidneys to concentrate)

literature

CP Carvounis, S. Nisar, S. Guro-Razuman: Significance of the fractional excretion of urea in the differential diagnosis of acute renal failure. In: Kidney International . Volume 62, Number 6, December 2002, pp. 2223-2229, ISSN  0085-2538 . doi : 10.1046 / j.1523-1755.2002.00683.x . PMID 12427149 .

See also

Fractional sodium excretion , dose adjustment in renal insufficiency .

This article is about a health issue. It is not used for self-diagnosis and does not replace a diagnosis by a doctor. Please note the information on health issues !