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Renal Arteries — Magnetic Resonance Angiography, With or Without Contrast

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

An imaging test that uses magnetic fields to show the renal arteries, which supply blood to the kidneys, with or without intravenous contrast.

Quick summary

["Renal artery MRA helps evaluate the blood flow and structure of the arteries supplying the kidneys."]

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

Key facts at a glance

LOINC
36544-5
Short code
MRA Renal v WO contr
Synonyms
MRA Renal v 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 (MRA) creates detailed images of the renal arteries, the blood vessels that carry blood to the kidneys. It may be performed with or without an injected contrast agent.

Why might I need this test?

This test may be used to investigate narrowed or blocked renal arteries, reduced kidney blood flow, or changes in the kidney arteries. It may also help evaluate blood-flow problems in people with high blood pressure or suspected renovascular disease.

How is the test performed?

You usually lie on a table inside an MRI scanner while the machine takes a series of images. If contrast is used, it is given through a vein in your arm; the scan generally causes no pain.

How do I prepare for the test?

Tell the imaging team about metal implants, heart devices, kidney disease, prior contrast reactions, and possible pregnancy. Follow the facility's instructions about eating, drinking, medications, and contrast use.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings may indicate narrowing, blockage, an aneurysm, or another abnormality of a renal artery. These findings must be interpreted with symptoms, blood pressure, kidney function, and other imaging or laboratory results because they do not always require treatment.

Short name

Renal artery MRA

Frequently asked questions

Is renal artery MRA the same as a kidney MRI?
It is a specialized MRI examination focused on the blood vessels supplying the kidneys. Other MRI sequences may also be used to examine the kidney tissue itself.
Does the test require intravenous contrast?
It may be performed with or without contrast. The imaging team will explain the planned approach and assess whether contrast is appropriate for you.
How long does the examination take?
The duration varies by facility and protocol. Contrast-enhanced studies may take longer because the scanner must acquire images before and after the contrast is injected.
  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