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MR Angiography for Thoracic Aortic Aneurysm, With and Without Contrast, Intravenous

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

An MRI-based examination of the thoracic aorta that may include noncontrast images and images obtained after intravenous contrast.

Quick summary

["This scan uses magnetic resonance imaging to examine the thoracic aorta and may help evaluate an aortic aneurysm."]

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

Key facts at a glance

LOINC
44131-1
Short code
MRA TA + AA WO+W contr IV
Synonyms
MRA TA + AA 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?

MR angiography, or MRA, is an MRI-based test that produces detailed images of blood vessels. For a thoracic aortic aneurysm evaluation, it examines the aorta in the chest and may include both noncontrast and intravenous contrast images.

Why might I need this test?

This test may be used to confirm or monitor an aortic aneurysm, assess its size and appearance, or look for related complications. It may also help evaluate the aorta before certain medical or surgical procedures.

How is the test performed?

You lie on a table that moves into an MRI scanner. The technologist may first take images without contrast and then give intravenous contrast and obtain additional images. The scan is noninvasive, but you must remain still during image acquisition.

How do I prepare for the test?

Follow the imaging center's instructions and tell the staff about implanted devices, prior contrast reactions, kidney disease, pregnancy, or possible pregnancy. Metal objects and cards containing magnetic material may need to be removed or kept away from the scanner.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Thoracic aortic aneurysm MRA

Frequently asked questions

Does this test involve radiation?
No. MRI does not use ionizing radiation, although intravenous contrast may be used during the examination.
Is intravenous contrast always used?
Not always. The examination may include images both before and after contrast, depending on the specific procedure ordered and the imaging center's protocol.
How long does the examination take?
The time varies with the scan protocol and whether contrast is needed. The imaging center can provide a more specific estimate 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