Serum Potassium (K+)

 Potassium is the most abundant intracellular cation that serves important functions such as regulate acid-base equilibrium, control cellular water balance, and transmit electrical impulses in skeletal and cardiac muscles.

Normal Values for Serum Potassium

  • Potassium: 3.5 – 5.0 mEq/L

Indications for Serum Potassium

  • Evaluates cardiac function, renal function, gastrointestinal function, and the need for IV replacement therapy.

Nursing Considerations for Serum Potassium

  • Note on the laboratory form if the client is receiving potassium supplementation.
  • Clients with elevated white blood cell counts and platelet counts may have falsely elevated potassium levels.