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Magnetic Resonance Angiography (MRA) — Intravenous Contrast

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

An MRI-based examination of blood vessels that uses intravenous contrast to help identify narrowing, blockage, aneurysms, or other vascular abnormalities.

Quick summary

["This test images the blood vessels using MRI and injected contrast to evaluate circulation and detect narrowing or other vascular problems."]

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

Key facts at a glance

LOINC
36422-4
Short code
MRA UE ves WO+W contr IV
Synonyms
MRA UE 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 produces detailed images of blood vessels. Intravenous contrast may be used to make the vessels and blood flow easier to see.

Why might I need this test?

A contrast-enhanced MRA may be used to investigate symptoms such as stroke-like symptoms, weakness, dizziness, or limb pain. It can also evaluate suspected aneurysms, vessel narrowing, congenital vascular conditions, or blood flow before a procedure.

How is the test performed?

You will lie on a table inside an MRI scanner while images are acquired. A contrast agent is usually injected through an intravenous line in your arm, and you may briefly feel warmth or pressure at the injection site.

How do I prepare for the test?

Tell the imaging team if you are pregnant, have kidney disease, have previously reacted to MRI contrast, or have metal or electronic implants in your body. Follow the facility's instructions; fasting is not universally required, but you may be asked to limit food or drink beforehand.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Contrast-enhanced MR angiography

Frequently asked questions

Does an MRA use radiation?
No. MRA uses a strong magnetic field and radio waves rather than ionizing radiation, although the injected contrast may be used to improve the images.
Is intravenous contrast always used for MRA?
Some MRA examinations are performed without contrast, but this test is identified as using intravenous contrast. The imaging team will confirm the planned protocol before the examination.
What if I am allergic to contrast or have kidney disease?
Tell the imaging team before the test. Prior contrast reactions, kidney function, pregnancy, and other health conditions may affect how the examination is planned or whether an alternative study is more appropriate.
  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