The 24-HRS-URINE-CATECHOLAMINE test is an advanced diagnostic investigation used to measure the total amount of catecholamines excreted in urine over a continuous 24-hour period. Catecholamines—primarily epinephrine (adrenaline), norepinephrine (noradrenaline), and dopamine—are hormones produced by the adrenal glands and play a vital role in regulating blood pressure, heart rate, stress response, and metabolic activity.

This test is most commonly prescribed to detect and evaluate conditions associated with excessive catecholamine production, such as pheochromocytoma, paraganglioma, neuroendocrine tumors, and certain adrenal disorders. Since catecholamine levels fluctuate throughout the day in response to physical activity, emotional stress, and posture, a 24-hour urine collection offers a more accurate and reliable assessment compared to a single blood or urine sample.

Abnormally high urinary catecholamine levels may indicate adrenal gland overactivity, chronic hypertension of unknown cause, unexplained episodes of palpitations, excessive sweating, headaches, or anxiety-like symptoms. Conversely, low levels can be associated with nervous system disorders or impaired adrenal function. The test is often used alongside related investigations such as plasma catecholamines, metanephrines, vanillylmandelic acid (VMA), and imaging studies to confirm diagnosis and monitor treatment outcomes.

Proper sample collection is critical for precise results. Patients are instructed to collect all urine passed over a full 24-hour period in a special container, usually containing a preservative. Certain foods, beverages, medications, and stress factors may interfere with test results; therefore, patients are advised to follow strict pre-test preparation guidelines as directed by their healthcare provider.

The 24-HRS-URINE-CATECHOLAMINE test is a valuable tool for early detection, accurate diagnosis, and long-term monitoring of adrenal and neuroendocrine conditions, enabling timely medical intervention and improved patient outcomes.