What is the role of urine sodium and osmolality test in the diagnosis of hypokalemia (low potassium level)?

Updated: Dec 06, 2018
  • Author: Eleanor Lederer, MD, FASN; Chief Editor: Vecihi Batuman, MD, FASN  more...
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A spot urine sodium and osmolality test obtained simultaneously with a spot urine potassium test can help to refine the interpretation of the urine potassium level. A low urine sodium level (< 20 mEq/L) with a high urine potassium level suggests the presence of secondary hyperaldosteronism.

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