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Magnetic Resonance Angiography (MRA), Renal Vessels, Without Contrast

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

A noninvasive MRI study that creates images of the blood vessels supplying the kidneys without using an IV contrast agent.

Quick summary

["This imaging test helps evaluate the renal blood vessels for narrowing, blockage, or other abnormalities."]

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

Key facts at a glance

LOINC
44133-7
Short code
MRA Renal ves WO contr
Synonyms
MRA Renal ves 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, uses magnetic fields and radio waves to create detailed images of blood vessels. In this study, the vessels supplying and draining the kidneys are examined without an IV contrast agent.

Why might I need this test?

This test may be ordered to investigate high blood pressure, reduced kidney function, sudden changes in kidney function, or symptoms suggesting a blood-vessel problem. It can help identify narrowing, blockage, aneurysms, or unusual vessel formations in the renal circulation.

How is the test performed?

You lie on a padded table that moves into a large MRI scanner. The technologist takes a series of images while you remain still, and the images are reviewed by a radiologist.

How do I prepare for the test?

Follow the imaging center's instructions and tell the staff about any implants, metallic objects, pregnancy, or kidney disease. You may be asked to remove jewelry, cards, and other magnetic items; fasting is usually not required for a noncontrast MRA.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings may indicate narrowing or obstruction of a renal vessel, an aneurysm, or another structural abnormality. Reduced blood flow to a kidney can contribute to high blood pressure or impaired kidney function, but findings must be interpreted with symptoms, examination, and other tests.

Short name

Renal Vessel MRA Without Contrast

Frequently asked questions

Does this MRA use contrast dye?
The test is ordered without an IV contrast agent. Some MRI facilities may use a different MRA technique or medication protocol, so confirm the instructions with the imaging center before your appointment.
Is renal vessel MRA painful?
MRI itself is generally painless, although the scanner can be noisy and somewhat confined. You may feel brief pressure or discomfort if a weight is used to help keep you still.
How will I receive my results?
A radiologist will interpret the images and send a report to your ordering clinician. Your clinician will explain the findings and discuss any additional testing or treatment that may be needed.
  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