Vanilmandelic Acid, 24Hrs Urine

What is the Vanillylmandelic Acid (VMA) 24hr Urine test?

This test measures the amount of vanillylmandelic acid, a breakdown product of catecholamines, in a 24-hour urine sample. It helps in diagnosing catecholamine-secreting tumors.


Why is the test performed?

It is primarily used to detect and monitor neuroendocrine tumors such as pheochromocytoma and neuroblastoma.


What sample is needed, and how is it collected?

Urine is collected over a 24-hour period in a provided container. The sample must be kept cool during collection.


How are the results interpreted?

Elevated VMA levels can suggest the presence of catecholamine-secreting tumors. Low or normal levels are usually not associated with such conditions.


Is any special preparation needed before the test?

Yes, avoid caffeine, certain fruits, and medications prior to the test. Follow your doctor's specific instructions.