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Magnetic Resonance Angiography, Aortic Arch — Without and With Intravenous Contrast

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

MRI-based imaging of the aortic arch and its branches, with and without IV contrast, to assess blood vessel anatomy and blood flow.

Quick summary

["This MRA examines the aortic arch and its major branches and may include an IV contrast injection."]

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

Key facts at a glance

LOINC
46360-4
Short code
MRA Ao arch WO+W contr IV
Synonyms
MRA Ao arch 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, creates detailed images of blood vessels using an MRI scanner. This examination focuses on the aortic arch, the curved portion of the main artery that carries blood from the heart to the body.

Why might I need this test?

Aortic arch MRA may be ordered to evaluate the arch and its branches when there is concern about narrowing, an aneurysm, or another blood-vessel abnormality. It may also be used to assess blood flow or the anatomy of vessels before a procedure.

How is the test performed?

You lie on a table inside an MRI scanner while images are acquired. If contrast is included, an IV line is placed and a gadolinium-based contrast agent is injected; images are then taken with and, when appropriate, without contrast.

How do I prepare for the test?

Tell the imaging team about prior contrast reactions, significant kidney disease, pregnancy, implanted medical devices, or metal in your body. Follow the facility's instructions about eating, drinking, and taking medications, and allow enough time for the examination.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings may include narrowing of the aorta or its branches, an aneurysm, or an unusual vessel shape or blood-flow pattern. These findings should be interpreted by a radiologist in the context of symptoms, examination, and other tests because an MRA image alone does not determine the cause or severity.

Short name

Aortic arch MRA

Frequently asked questions

Does this test use radiation?
No. MRA uses magnetic fields and radio waves rather than ionizing radiation.
Why are some images taken with and without contrast?
Noncontrast images provide a baseline, while contrast-enhanced images can make blood vessels and certain abnormalities easier to evaluate. The exact protocol depends on the reason for the examination.
What if I am allergic to contrast or have kidney disease?
Tell your care team before the examination. They can assess the risk, review kidney function if needed, and decide whether contrast should be used or modified.
  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