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Magnetic Resonance Angiography, Lower Extremity — Without Contrast

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

An MRI-based examination of the blood vessels in one or both legs performed without injected contrast.

Quick summary

["This test uses MRI to assess blood flow and detect narrowing, blockage, or other abnormalities in the leg arteries."]

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

Key facts at a glance

LOINC
38773-8
Short code
MRA LE ves-R WO contr
Synonyms
MRA LE ves-R WO contr
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
0
Ref high
20
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
mr-angio
CPT
85651
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 (MRA) is an imaging test that uses a strong magnetic field and radio waves to create detailed pictures of blood vessels. A lower-extremity MRA evaluates vessels in the legs without injected contrast.

Why might I need this test?

A clinician may order this test to evaluate reduced blood flow, unexplained leg pain or swelling, or a suspected blood clot. It may also be used to assess an artery weakened by an aneurysm or other vascular condition.

How is the test performed?

You will lie on a table inside an MRI scanner while images of the vessels in your legs are recorded. You will usually need to remain still and may be asked to hold your breath briefly. No contrast dye is injected for this version of the test.

How do I prepare for the test?

Tell the imaging team if you have a pacemaker, another implanted medical device, metal fragments in your body, or a possible pregnancy. Remove personal metal items and follow any instructions provided by the imaging center; special fasting or contrast-related preparation is generally not required.

Reference range

Adult males: 0-15 mm/hr; Females: 0-20 mm/hrN/A

Specimen: serum

No special preparation required. CRP may be affected by acute illness.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lower-extremity MRA without contrast

Frequently asked questions

Does this MRA use contrast dye?
No. This test is performed without injected contrast, although the MRI scanner still produces images using magnetic fields and radio waves.
Is magnetic resonance angiography the same as a routine MRI?
It uses similar MRI technology, but the images are specifically focused on blood vessels and blood flow rather than general structures such as bones, muscles, or organs.
Will I need to lie still inside the scanner?
Yes. Remaining still helps produce clear images, and you may receive instructions to hold your breath briefly during certain parts of the scan.
  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