Potassium is an essential electrolyte that regulates nerve signals, muscle contractions, and fluid balance.

The 24-hour urine test provides a more accurate measure of potassium excretion compared to a single random urine sample.

Clinical uses include:

Assessing kidney function and tubular handling of potassium.

Investigating causes of hypokalemia (low potassium) or hyperkalemia (high potassium).

Monitoring patients with hypertension, adrenal disorders, or diuretic therapy.

Evaluating dietary potassium intake and excretion balance.

The test requires collecting all urine passed in 24 hours in a special container.

Analyte: Potassium concentration in 24-hour urine.

Normal Range: Approximately 25–125 mmol/24 hrs (varies by lab and diet).

High Potassium Excretion: May indicate excessive dietary intake, diuretic use, renal tubular disorders, or hyperaldosteronism.

Low Potassium Excretion: May suggest poor intake, chronic kidney disease, adrenal insufficiency, or hypokalemia due to non-renal causes.

Clinical Use:

Detects abnormalities in potassium metabolism.

Differentiates renal vs non-renal causes of potassium imbalance.

Supports diagnosis of endocrine and renal disorders.