When blood potassium is low (hypokalemia), urinary potassium helps identify the cause. Low urine potassium with hypokalemia suggests GI losses or shift of potassium into cells; high urine potassium suggests inappropriate kidney loss from diuretics, hormonal disorders, or inherited tubular disorders.
This test is used in evaluation of unexplained hypokalemia, suspected hyperaldosteronism, certain metabolic disorders, and chronic diuretic use. It is typically interpreted alongside other electrolytes and clinical findings. Sample type is a random urine specimen.
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