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Magnetic Resonance Angiography, Lower-Extremity Vessels — Without and With Intravenous Contrast

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

This imaging test evaluates blood flow in the arteries or veins of the legs, using MRI images before and after intravenous contrast.

Quick summary

["Lower-extremity MRA can help identify narrowing, blockage, or other abnormalities of the leg blood vessels."]

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

Key facts at a glance

LOINC
44128-7
Short code
MRA LE ves WO+W contr IV
Synonyms
MRA LE 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 imaging test that shows the blood vessels in the lower legs and uses special techniques to assess blood flow. It is not a blood test and does not use ionizing radiation.

Why might I need this test?

A clinician may order this test to investigate leg pain, swelling, reduced pulses, numbness, or a suspected blood clot. It may also be used to evaluate circulation before a procedure or to monitor a known vascular condition.

How is the test performed?

You lie on a table inside an MRI scanner while images are taken of your lower-extremity vessels. Because the examination includes images with contrast, contrast material is usually injected through an intravenous line during the scan.

How do I prepare for the test?

Follow the imaging center's instructions and tell the care team about prior contrast reactions, kidney disease, pregnancy, implanted medical devices, or metal in your body. Fasting is generally not required unless specifically requested; wear clothing without metal fasteners if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

MRA of the lower-extremity blood vessels

Frequently asked questions

Does this MRA use radiation?
No. MRI-based angiography does not use ionizing radiation, although contrast material may be used.
Will I need an intravenous line?
Usually, yes, because this examination includes images obtained after intravenous contrast is administered.
What if I am pregnant or have kidney disease?
Tell the imaging team before the appointment. They will review the reason for the study, your pregnancy status, and any contrast-related risks before proceeding.
  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