urinary potassium

Urinary potassium refers to the quantity of potassium ions excreted in the urine, which reflects renal potassium handling through the combined processes of filtration, reabsorption, and secretion primarily in the distal nephron, including the distal convoluted tubule and collecting duct. This parameter is commonly measured to assess potassium homeostasis, distinguish renal from extrarenal potassium wasting, and monitor patients on diuretics or with suspected electrolyte disorders. Potassium excretion is regulated by hormones (e.g., aldosterone), dietary intake, blood pH, and the activity of renal transport systems such as Na-K-ATPase, luminal potassium channels (ROMK, Maxi-K), and potassium-chloride cotransporters.

Other names

potassium in urineurine potassiumK⁺ urinary excretionurinary K⁺

drugs influence urinary potassium excretion mainly by affecting Na-K-ATPase, renal potassium channels (ROMK, Maxi-K), or aldosterone-sensitive pathways