ISSN 2398-2942      

Blood biochemistry: potassium

icanis
Contributor(s):

Kathleen P Freeman

Synonym(s): K


Overview

  • 98% of potassium is intracellular but passive and freely diffusable in and out of cells.
  • 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.

Availability

  • Widely available at commercial laboratories.

Technique (intrinsic) limitations

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

Result Data

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Further Reading

Publications

Refereed papers

Other sources of information

  • Ettinger S J & Feldman E C (2000) Eds. Textbook of Veterinary Internal Medicine. 5th edn. W B Saunders & Co, USA.
  • Kaneko J J, Harvey J W & Brass M L (1997) Eds. Clinical Biochemistry of Domestic Animals. 5th edn. Academic Press, USA.
  • Duncan J R, Prasse K W & Mahaffey E A (1994) Veterinary Laboratory Medicine. Clinical Pathology. 3rd edn. Iowa University Press, USA.

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