How is potassium excreted?

Updated: Apr 09, 2020
  • Author: Eleanor Lederer, MD, FASN; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Answer

Under normal conditions, approximately 90% of potassium excretion occurs in the urine, with less than 10% excreted through sweat or stool. Within the kidneys, potassium excretion occurs mostly in the principal cells of the cortical collecting duct (CCD). Urinary potassium excretion depends on adequate luminal sodium delivery to the distal convoluted tubule (DCT) and the CCD, as well as the effect of aldosterone and other adrenal corticosteroids with mineralocorticoid activity.


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