Magnetic Resonance Angiography, Head Vessels — with Intravenous Contrast
An imaging test that uses magnetic fields and intravenous contrast to show blood vessels in the head, helping evaluate narrowing, blockage, or aneurysms.
["This MRA provides detailed images of blood vessels in the head and helps identify narrowing, blockages, or weakened vessel walls."]
Key facts at a glance
- LOINC
- 24593-6
- Short code
- MRA Head ves W contr IV
- Synonyms
- MRA Head ves 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?
Magnetic resonance angiography, or MRA, is an MRI-based test that creates detailed images of blood vessels. This version uses intravenous contrast material to improve the visibility of vessels in the head.
Why might I need this test?
A head MRA may be used to investigate suspected narrowing or blockage of blood vessels, an aneurysm, or an abnormal connection between vessels. It may also be performed after a stroke or when symptoms suggest a problem with blood flow to the brain.
How is the test performed?
You will lie on a table inside an MRI scanner while images are taken. Intravenous contrast is given through a vein in your arm, and the scan may take about 30 to 60 minutes. You may be able to hear knocking or other sounds from the scanner.
How do I prepare for the test?
Follow the imaging center's instructions, including any fasting requirements. Tell the staff about contrast allergies, kidney disease, pregnancy or breastfeeding, and metallic implants or devices in your body. Remove jewelry, watches, hairpins, and other metal objects before the scan.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal findings may indicate a narrowed or blocked blood vessel, an aneurysm, an abnormal vessel connection, or a blood clot. The results are interpreted together with symptoms, medical history, and other examinations. A radiologist will provide the final report to your healthcare professional.
Short name
Head MRA with IV contrast
Frequently asked questions
Does a head MRA use radiation?
Is intravenous contrast always required?
What should I do if I am allergic to contrast or have kidney disease?
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