Carotid Vessel MR Angiography With Intravenous Contrast
An MRI-based scan of the carotid arteries uses IV contrast to create detailed images and help evaluate narrowing or other problems in blood flow to the brain.
["This test uses MRI and injected contrast to examine the carotid arteries, which carry blood to the brain."]
Key facts at a glance
- LOINC
- 36829-0
- Short code
- Deprecated Carot ves MR.angio W contr IV
- Synonyms
- Deprecated Carot ves MR.angio 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?
Carotid magnetic resonance angiography, or MRA, is an imaging test that creates detailed pictures of the carotid arteries in the neck. This version uses a gadolinium-based contrast injected through a vein to help show the arteries and assess blood flow.
Why might I need this test?
The test may be ordered to evaluate symptoms of reduced blood flow to the brain, such as a sudden weakness, trouble speaking, or vision changes. It can also be used to investigate the carotid arteries before certain procedures or when other imaging findings need further evaluation.
How is the test performed?
You will lie inside an MRI scanner while images of the arteries are taken. A technologist may place an IV line and inject contrast, and you may be asked to remain still during the scan. The test does not use ionizing radiation.
How do I prepare for the test?
Follow the facility's instructions about eating, drinking, and medications. Tell the care team about any prior contrast reaction, kidney disease, pregnancy or breastfeeding, and MRI-compatible implants or devices. The MRI facility will also ask about claustrophobia and other conditions that may affect the scan.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal findings may indicate narrowing or blockage of a carotid artery, a tear in an artery wall, an aneurysm, or another condition affecting blood flow to the brain. The results should be interpreted with symptoms, examination findings, and other imaging or tests. A concerning finding may prompt additional vascular evaluation or urgent care.
Short name
Carotid MRA with IV contrast
Frequently asked questions
Is this the same as a carotid ultrasound?
Does the test use radiation?
What should I do if I am pregnant or breastfeeding?
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