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Magnetic Resonance Angiography (MRA) Without Contrast

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

An MRI-based imaging test that evaluates blood vessels without using an injected contrast agent.

Quick summary

["MRA without contrast creates detailed images of blood vessels to help identify narrowing, blockage, or other vascular problems."]

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

Key facts at a glance

LOINC
36433-1
Short code
MRA TA WO contr
Synonyms
MRA TA WO contr
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 uses strong magnetic fields and radio waves to create pictures of blood vessels. In this version, no injected contrast agent is used.

Why might I need this test?

Your clinician may order MRA to evaluate blood flow and look for conditions such as narrowed or blocked arteries, aneurysms, or blood vessel abnormalities. It may be used to investigate symptoms, plan treatment, or monitor a known condition.

How is the test performed?

You will lie on a table inside an MRI machine while the scanner takes a series of images. The procedure is painless, but the machine can be noisy and may feel restrictive if you are in a narrow space.

How do I prepare for the test?

Follow the instructions provided by the imaging center. You may be asked to remove jewelry, hearing aids, and other metal or electronic items. Tell the care team about implants, claustrophobia, pregnancy, or any other MRI safety concerns before the scan.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal MRA findings may indicate narrowing, blockage, an aneurysm, or another abnormality involving a blood vessel. The results should be interpreted by a radiologist together with your symptoms, examination, and other tests. A reassuring image does not rule out every possible vascular condition.

Short name

MRA without contrast

Frequently asked questions

Does this MRA use injected contrast?
No. This test is specified as MRA without contrast, so no IV contrast agent is administered. Follow the imaging center's instructions in case additional preparation is required.
Is magnetic resonance angiography painful?
The scan itself is generally painless. Some people feel uncomfortable in the enclosed scanner or bothered by the loud knocking sounds.
Do I need to fast for an MRA without contrast?
Fasting is not usually necessary, but the order or imaging center may provide different instructions. Tell the care team about pregnancy, metal implants, or previous reactions to contrast media even though contrast is not planned.
  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