Felis ISSN 2398-2950

Blood biochemistry: potassium

Synonym(s): K

Contributor(s): Kathleen P Freeman

Overview

  • 90% of potassium is intracellular, 2% extracellular, and the remainder is transcellular.
  • Distribution across cell membrane crucial in cardiac and neuromuscular membrane potentials.
  • Major intracellular cation. Intracellular location maintained by ATP - dependent sodium:potassium pump.
  • Changes in plasma levels reflect fluid balance, rate of renal excretion and changes in balance between intra- and extracellular fluid.

Sampling

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Tests

Methodologies

  • Ion-specific electrode most commonly used.

Technique (intrinsic) limitations

  • Test results only significant in conjunction with other laboratory results and clinical findings.

Technician (extrinsic) limitations

  • Routine test.

Result Data

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Further Reading

Publications

Refereed papers

  • Recent references from VetMed Resource and PubMed.
  • Skelly B (2002) Causes, consequences and control of potassium imbalances in small animals. In Practice 24(10), 596-604.
  • Schaer M (1999) Disorders of serum potassium, magnesium and chloride. J Vet Emerg Crit Care 9, 209-217.
  • Macintire D K (1997) Disorders of potassium, phosphorus and magnesium in critical illness. Cont Ed Pract Vet 19, 41-49, 83.
  • Fettman M J (1989) Feline kalipenic polymyopathy/nephropathy syndrome. Vet Clin North Am Small Anim Pract 19(3), 415-432.
  • Hopkins AL (1989) Sporadic feline hypokalemic polymyopathy. Vet Rec 125(1), 17.

Other sources of information

  • Ettinger S J & Feldman E C (eds) (2000) Textbook of Veterinary Internal Medicine. 5th edn. Philadelphia: W B Saunders & Co. ISBN: 0 7216 6795 3.
  • Philips, S L & polzin D J (1998) Clinical disorders of potassium homeostasis - hyperkalemia and hypokalemia. Vet Clin North Am 28, 545-564.
  • Kaneko J J, Harvey J W & Brass M L (eds) (1997) Clinical Biochemistry of Domestic Animals. 5th edn. Boston: Academic Press. ISBN: 0 1239 6305 2.
  • Duncan J R, Prasse K W & Mahaffey E A (1994) Veterinary Laboratory Medicine. Clinical Pathology. 3rd edn. Iowa: Iowa University Press.


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