The 24-hour Vanillylmandelic Acid (VMA) test measures a breakdown product of catecholamines like epinephrine and norepinephrine to help detect tumors such as neuroblastomas and pheochromocytomas by looking for elevated VMA levels in the urine. The test involves collecting all urine over a 24-hour period using specific containers and preservatives to ensure accurate results. Elevated VMA can also be caused by other conditions like anxiety or certain medications, so identifying such factors to the laboratory is crucia
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