Proceeds from website advertising help sustain Lab Tests Online. AACC is a not-for-profit organization and does not endorse non-AACC products and services.

Vanillylmandelic Acid (VMA)

Print this article
Share this page:
Also known as: VMAU
Formal name: Vanillylmandelic Acid, urine

Board approvedAll content on Lab Tests Online has been reviewed and approved by the Editorial Review Board.

At a Glance

Why Get Tested?

To help diagnose or rule out a neuroblastoma or other neuroendocrine tumor; to monitor the effectiveness of treatment

When to Get Tested?

When your child has a lump in the abdomen (abdominal mass), bruising around the eyes, trouble walking, or bone pain; when you have symptoms of increased catecholamine release, such as persistent or periodic high blood pressure, severe headaches, rapid heart rate, and sweating; when you have been treated for a neuroendocrine tumor, such as neuroblastoma

Sample Required?

A 24-hour urine sample is preferred; sometimes a random urine sample is acceptable.

Test Preparation Needed?

This test is affected by caffeine, certain foods, certain drugs, and stresses. Inform your healthcare practitioner of any medications you are taking and follow any instructions you are given for things to avoid before sample collection.