Potassium, Urine

Potassium, Urine is a topic covered in the Davis's Lab & Diagnostic Tests.

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Urine K+.

To evaluate electrolyte balance, acid-base balance, and hypokalemia.

Patient Preparation
There are no food, fluid, activity, or medication restrictions unless by medical direction. Usually, a 24-hr urine collection is ordered. As appropriate, provide the required urine collection container and specimen collection instructions.

Normal Findings
Method: Ion-selective electrode.

AgeConventional UnitsSI Units (Conventional Units × 1)
6–10 yr
 Male17–54 mEq/24 hr or mmol/24 hr17–54 mmol/24 hr
 Female8–37 mEq/24 hr or mmol/24 hr8–37 mmol/24 hr
10–14 yr18–58 mEq/24 hr or mmol/24 hr18–58 mmol/24 hr
Adult–older adult26–123 mEq/24 hr or mmol/24 hr26–123 mmol/24 hr
Note: Reference values depend on potassium intake and diurnal variation. Excretion is significantly higher at night.Potassium excretion declines in older adults due to the decline in aldosterone levels, decline in kidney function, and effects of commonly prescribed medications that inhibit the renin-angiotensin-aldosterone system.

Critical Findings and Potential Interventions

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