Potassium urine

Keywords: Urine potassium, Urine K

Specimen:

Random or 24 h urine specimen.

Method:

ISE or flame emission spectrophotometry.

Reference Interval:

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

Application:

Differentiation 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.

Reference:

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