Collection Notes: The 24-hour urine is to be collected with 25 mL of 6N HCl to maintain pH below 3. Record the 24-hour urine volume on test request form and on the urine vial. Specimen may be transported at room temperature.
Clinical Utility: The measurement of circulating catecholamines is useful in the diagnosis of catecholamine secreting tumors associated with hypertension.
24-Hour Urine with HCl (10 mL)
Ambient 7 Days
Refrigerated 30 Days
Frozen 49 Days
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