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Renal Artery Magnetic Resonance Angiography With or Without Intravenous Contrast

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

A renal MRA uses magnetic resonance imaging to examine the arteries supplying the kidneys, with or without intravenous contrast.

Quick summary

["This imaging test helps evaluate the kidney arteries for narrowing, blockage, or other abnormalities."]

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

Key facts at a glance

LOINC
36275-6
Short code
MRA Renal a WO+W contr IV
Synonyms
MRA Renal a 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?

Renal magnetic resonance angiography, or renal MRA, creates detailed images of the arteries that carry blood to the kidneys. It may be performed with or without an intravenous contrast agent.

Why might I need this test?

A clinician may order this test to investigate high blood pressure, reduced kidney function, or symptoms suggesting poor blood flow to the kidneys. It can also be used to evaluate the kidney arteries before certain procedures.

How is the test performed?

You lie on a table while an MRI scanner takes images of the renal arteries. If contrast is used, it is given through a vein in your arm, and the scan may be repeated quickly after the injection.

How do I prepare for the test?

Tell the imaging team about prior contrast reactions, kidney problems, metal implants, and pregnancy. Follow the facility's instructions about eating, drinking, and taking medicines; medication or hydration advice may differ depending on whether contrast is planned.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Renal MRA

Frequently asked questions

Is a renal MRA the same as a kidney biopsy?
No. A renal MRA is a noninvasive imaging test of the kidney arteries, whereas a kidney biopsy removes a small piece of kidney tissue for laboratory examination.
Does renal MRA always use intravenous contrast?
No. Contrast-enhanced and noncontrast techniques are available, and the choice depends on the clinical question and the imaging facility's protocol.
Is this test safe?
MRI generally avoids radiation, but contrast can cause allergic-like reactions and may require special precautions in people with significant kidney impairment. The imaging team will review these risks 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