Vanillylmandelic acid

Vanillylmandelic acid (VMA) is a metabolite of catecholamines epinephrine and norepinephrine. It is used as a reagent to detect disorders related to the adrenal gland.

Overview

VMA is a chemical compound that is produced when the body breaks down dopamine, epinephrine, and norepinephrine. These chemicals are called catecholamines and are used by nerve cells to send signals.

Medical Use

The VMA test is a urine test that measures the amount of vanillylmandelic acid in the urine. It is used to detect and monitor neuroblastoma and pheochromocytoma, two types of tumors that can increase the production of catecholamines.

Procedure

The test is performed by collecting all urine over a 24-hour period. This is done by urinating into a special container, which is then sent to a laboratory for analysis. The amount of VMA in the urine is measured and the results are used to determine if there is an abnormal amount of catecholamines in the body.

Risks

There are no significant risks associated with the VMA test. However, certain medications and foods can affect the results of the test. Therefore, it is important to inform your doctor of any medications you are taking and to follow any dietary restrictions before the test.

See Also

• Catecholamines
• Epinephrine
• Norepinephrine
• Neuroblastoma
• Pheochromocytoma

References

• National Institutes of Health
• Mayo Clinic

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