Potassium - urine

Last updated: Thursday, 25, March, 2004

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Item Process
Specimen

Random or 24 hour urine specimen.

Method

ISE or flame emission spectrophotometry.

Reference Interval

40-100 mmol/24 hours (varies with intake).

ApplicationDifferentiation of renal potassium loss from other causes of hypokalaemia.
Interpretation

Mineralocorticoid excess, some renal tubular disorders, metabolic alkalosis, some diuretics and Bartter’s syndrome cause renal potassium loss.

With decreased intake or increased GIT loss, renal potassium loss is decreased.

ReferenceEthier JH et al. Am J Kid Dis 1990; 15: 309-315.