Felis ISSN 2398-2950

Fractional electrolyte excretion

Synonym(s): Urine fractional excretion

Contributor(s): Penney Barber, Ludovic Pelligand

Overview

  • The clinical use of excretion fraction is limited but on occasion, these tests may be cost-effective when prioritizing renal investigations Renal function assessment.
  • See also iohexol and creatinine clearances for estimation of GFR Creatinine clearance.
  • Plasma concentrations of electrolytes stay within normal range until renal failure advanced.

Sampling

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Tests

Methodologies

  • FE electrolyte % = ((Urine [electrolyte] x plasma [creatinine])/(Urine [creatinine] x plasma [electrolyte])) x 100.

Availability

  • Widely available through most commercial laboratories.

Technique (intrinsic) limitations

  • Simple technique.

Result Data

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Further Reading

Publications

Refereed papers

  • Recent references from VetMed Resource and PubMed.
  • Pressler B (2013) Clinical approach to advanced renal function testing in dogs and cats. Vet Clin Small Anim 43, 1193-1208 PubMed.

Other sources of information

  • DiBartola S P (2005) Renal disease: clinical approach and laboratory evaluation. In: Textbook of Veterinary Medicine. Ettinger S J & Feldman E C (eds), pp 1716-1730.


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