Skip to content

Urinary Vanillylmandelic Acid (VMA) with Probe Confirmation

Published: August 9, 2026Updated: August 16, 2026

This test measures a breakdown product of certain hormones in your urine, often used to check for conditions affecting the adrenal glands or tumors.

Quick summary

["VMA helps detect hormonal imbalances or tumors that produce excess catecholamines."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
7968-1
Short code
MuV RNA CSF Ql NAA+probe
Synonyms
MuV RNA CSF Ql NAA+probe
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your doctor may recommend this test if you have symptoms like high blood pressure, rapid heartbeat, headaches, or unexplained weight loss. It’s also used to monitor conditions such as pheochromocytoma (a rare tumor) or adrenal gland issues.

What to Expect Before the Test

No special preparation is needed, but you may be asked to collect a 24-hour urine sample. Drink plenty of water to help flush out the hormones naturally. Avoid certain medications that could affect results, but your doctor will guide you.

What Happens During the Test

You’ll provide a urine sample (usually over 24 hours) that’s tested for VMA levels. The lab uses a specialized probe method to confirm the presence of this hormone metabolite.

What the Results Mean

High levels of VMA may suggest conditions like pheochromocytoma or other adrenal-related disorders. Low levels might indicate normal function or other hormonal issues. Your doctor will interpret results in the context of your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

VMA Urine Test (Confirmatory)

Frequently asked questions

How often do I need this test?
This test is typically ordered as needed for specific symptoms or diagnostic purposes. Follow-up may depend on your treatment plan or ongoing symptoms. Your doctor will determine if repeat testing is required.
What are the normal ranges for this test?
There are no standard reference ranges provided here since they can vary by lab and patient factors. Your doctor will use the results alongside clinical judgment to guide care.
Can diet or medications affect this test?
Certain foods, supplements, or medications (like some antidepressants or blood pressure drugs) may influence VMA levels. Always inform your doctor about all medications or dietary changes before testing.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy