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Magnetic Resonance Angiography, Head — With/Without Contrast, Intravenous

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

An MRI-based scan of blood vessels in the head and brain, used to evaluate narrowing, blockage, or aneurysm. Intravenous contrast may be used.

Quick summary

["A head MRA creates detailed images of cerebral blood vessels to help identify problems such as narrowing, clots, or aneurysms."]

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

Key facts at a glance

LOINC
36826-6
Short code
MRA Head vv W contr IV
Synonyms
MRA Head vv W contr IV
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
mr-angio
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test?

Magnetic resonance angiography, or MRA, is an imaging test that shows the blood vessels in your head and brain. It is performed with an MRI machine and may include contrast material given through a vein.

Why might I need this test?

A head MRA may be ordered to evaluate symptoms such as severe headache, weakness, speech difficulty, vision changes, or dizziness. It is also used to monitor certain conditions involving the brain's blood vessels.

How is the test performed?

You will lie on a table inside an MRI scanner while several sequences of images are taken. If intravenous contrast is used, it is administered through a vein, and you may be asked to remain still during the scan.

How do I prepare for the test?

Tell the imaging team if you have metal implants, a pacemaker, kidney disease, a prior contrast reaction, or possible pregnancy. Follow the facility's instructions about food, medications, and arriving early for safety screening.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings may indicate narrowing or blockage of a brain blood vessel, an aneurysm, blood clots, or inflammation. A radiologist reviews the images in the context of your symptoms and other tests. Your healthcare professional will explain the significance of any findings.

Short name

Head MRA

Frequently asked questions

Is a head MRA the same as a routine brain MRI?
No. A routine MRI focuses mainly on brain tissue, while MRA is designed to emphasize the blood vessels.
Will I receive intravenous contrast?
The order may include contrast-enhanced and non-contrast images. If contrast is used, it is given through a vein and some people may feel warm or experience a brief metallic taste.
Can I have an MRA if I am claustrophobic?
Many facilities offer relaxation techniques, medication, or a wider scanner to help with anxiety. Discuss your concerns with the imaging team before the examination.
  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