Magnetic Resonance Angiography (MRA) of the Renal Vessels, With or Without Contrast, Intravenous
A magnetic resonance imaging test that evaluates the blood vessels supplying the kidneys and the blood flow through them.
["Renal MRA uses imaging and sometimes intravenous contrast to assess kidney blood vessels and identify narrowing or other vascular problems."]
Key facts at a glance
- LOINC
- 36415-8
- Short code
- MRA Renal v WO+W contr IV
- Synonyms
- MRA Renal v 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 MRA, is an imaging test that shows the blood vessels connected to the kidneys. It may be performed with or without intravenous contrast, depending on the imaging plan and the reason for the test.
Why might I need this test?
This test may be ordered to evaluate reduced kidney function, high blood pressure, or suspected narrowing, blockage, or another abnormality of a renal blood vessel. It can also help plan treatment or monitor a known vascular condition.
How is the test performed?
You usually lie on a table while a large magnet and specialized coils take images. If contrast is used, it is given through a vein in your arm; the scan generally requires you to remain still and may take 30 to 60 minutes.
How do I prepare for the test?
Follow the imaging center's instructions and tell the staff about metal implants, pregnancy, kidney disease, or any prior reaction to contrast. You may be asked to remove metal items and may need blood tests to assess kidney function if contrast will be used.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal findings may include narrowing, blockage, abnormal vessel shape, or an aneurysm involving a kidney blood vessel. These findings may help explain reduced kidney function or high blood pressure and guide further evaluation or treatment. Imaging results should be interpreted by your clinician in the context of your symptoms and other tests.
Short name
Renal MR Angiography
Frequently asked questions
Is renal MRA the same as a kidney biopsy?
Will I receive intravenous contrast?
Is the radiation exposure the same as a standard CT scan?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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