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Magnetic Resonance Angiography (MRA), Head Vessels — With or Without Intravenous Contrast

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

An MRI-based imaging test that shows blood vessels in the head and brain, with or without IV contrast, to help evaluate narrowing, blockage, or aneurysms.

Quick summary

["Head MRA creates detailed images of the brain's blood vessels to help identify and evaluate vascular abnormalities."]

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

Key facts at a glance

LOINC
36857-1
Short code
MRA Head ves WO+W contr IV
Synonyms
MRA Head ves WO+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 MRI-based test that images the blood vessels in the head and brain. Your care team may order it with or without intravenous (IV) contrast, depending on the information needed.

Why might I need this test?

Head MRA may be used to evaluate symptoms such as severe headache, dizziness, weakness, vision changes, or signs of a possible stroke. It can also help assess the blood vessels before certain procedures or treatments.

How is the test performed?

You will lie on a table inside an MRI machine while images of your head's blood vessels are taken. If contrast is used, it is given through an IV line; the scan itself is generally painless, although lying still and the confined space may be uncomfortable.

How do I prepare for the test?

Follow the imaging center's instructions and tell the staff about metal implants, prior contrast reactions, kidney disease, pregnancy, or breastfeeding. Remove jewelry and other metal objects before the scan, and allow extra time if an IV line is needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Head MRA with or without IV contrast

Frequently asked questions

Does head MRA use radiation?
No. MRA uses magnetic fields and radiofrequency signals rather than ionizing radiation.
Is intravenous contrast always required for MRA?
No. Some head MRA studies are performed without contrast, while others use an IV gadolinium-based contrast agent. The radiologist or ordering clinician determines which approach is appropriate.
What if I have a contrast allergy or kidney disease?
Tell the imaging staff before the test. They can assess the risk, review available imaging options, and determine whether contrast should be used or avoided.
  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