Which urine potassium levels indicate impaired renal excretion?

Updated: Jun 20, 2018
  • Author: Eleanor Lederer, MD, FASN; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Answer

Measurement of urine potassium and sodium concentrations and urine osmolality is essential to determine whether impairment of renal excretion is contributing to the hyperkalemia. A urine potassium level below 20 mEq/L suggests impaired renal excretion. A urine potassium level above 40 mEq/L suggests intact renal excretory mechanisms, implying that high intake or failure of cell uptake is the major mechanism for hyperkalemia


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