Skip to content

Magnetic Resonance Angiography (MRA), Thoracic Aorta — With or Without Intravenous Contrast

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

An MRI-based examination that creates images of the thoracic aorta, with and sometimes without intravenous contrast.

Quick summary

["This test uses MRI to evaluate the thoracic aorta for narrowing, aneurysms, or other abnormalities."]

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

Key facts at a glance

LOINC
36274-9
Short code
MRA TA WO+W contr IV
Synonyms
MRA TA 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 imaging test that produces detailed pictures of blood vessels. This examination evaluates the thoracic aorta, the main artery carrying blood from the heart through the chest.

Why might I need this test?

A thoracic aortic MRA may be ordered to investigate symptoms such as chest or back pain, or to evaluate an aortic aneurysm, narrowing, dissection, or other vascular condition. It may also be used to monitor a known aortic finding.

How is the test performed?

You lie on a table inside an MRI scanner while images are acquired. The protocol may include images before and after intravenous contrast is administered; the technologist and radiologist determine the appropriate sequence.

How do I prepare for the test?

Follow the imaging center's instructions, including any fasting requirements. Tell the care team if you have an MRI or contrast allergy, significant kidney disease, an implanted medical device, or are pregnant, and remove metal items before entering the scanner area.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Thoracic aortic MRA

Frequently asked questions

Does this test use radiation?
No. MRI uses magnetic fields and radio waves rather than ionizing radiation.
Why might images be taken with and without contrast?
Noncontrast and contrast-enhanced images can provide complementary information. The imaging team may perform either or both, depending on the clinical question.
What should I tell the team before receiving IV contrast?
Tell the team about prior contrast reactions, allergies, kidney disease, and pregnancy or breastfeeding. The team will assess whether contrast can be safely administered.
  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