Potassium Urine Test

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Latest Edit: Hector 2014-03-24 (EDT)

See Also Lab Tests

Potassium is the major cation within the cell. A 24-hour urine collection of potassium is particularly important to evaluate electrolyte balance, acid-base balance, and renal and adrenal diseases.[1]


  • Serum potassium concentration depends on many factors such as aldosterone and to a lesser extent, glucocorticosteroids
  • If sodium blood levels are diminished, the renal tubules can reabsorb sodium in exchange for potassium, which is then excreted at increased rates;

Patient Preparation

  • No preparation is required.

Interfering Factors

  • Factors which can cause increased levels:
  • excessive intake of licorice
  • Drugs: diuretics, glucocorticoids, and salicylates

Clinical Implications


High levels indicate:

  • Chronic renal failure
  • Renal tubular acidosis
  • Starvation
  • Cushing's syndrome
  • Hyperaldosteronism
  • Excessive intake of licorice
  • Alkalosis
  • Diuretic therapy

Low levels indicate:

Associated Tests


  1. Pagana Kathleen D, Pagana Timothy J (1998) Mosby's Manual of Diagnostic and Laboratory Tests, Mosby, Inc