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Magnetic Resonance Angiography (MRA) of the Head — With and Without Contrast

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

An imaging test that evaluates the blood vessels in the brain, using noncontrast images and, when indicated, intravenous contrast.

Quick summary

["This test creates detailed images of the brain's blood vessels to help evaluate narrowing, blockage, or abnormal vessel formations."]

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

Key facts at a glance

LOINC
36876-1
Short code
MRA Head vv WO contr
Synonyms
MRA Head vv 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, is an MRI-based test that shows the major blood vessels supplying the brain. This examination may include images taken before and after intravenous contrast is given.

Why might I need this test?

A head MRA may be ordered to investigate symptoms such as sudden weakness, trouble speaking, severe headache, dizziness, or vision changes. It can also be used to evaluate known blood-vessel conditions or monitor certain abnormalities over time.

How is the test performed?

You lie on a table that moves inside an MRI scanner. The scanner uses magnetic fields and radio waves to create images, and contrast dye may be injected through a vein in your arm.

How do I prepare for the test?

Follow the imaging center's instructions and tell the staff about any prior contrast reaction, kidney disease, pregnancy, or metal implants in your body. You may need to avoid eating or drinking beforehand, and you should remove items such as jewelry, cards, and phones before entering the scanner room.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Head MRA with and without contrast

Frequently asked questions

Is a head MRA the same as a brain MRI?
A brain MRI examines brain tissue, while MRA focuses on blood vessels. Some centers perform both as part of the same imaging session.
Is intravenous contrast always used?
Not always. This MRA includes noncontrast and contrast-enhanced imaging, but the technologist will explain what is needed before the examination.
What should I do if I am uncomfortable in an MRI scanner?
Tell the imaging staff before the test. Many facilities offer breathing guidance, communication devices, breaks, or sedation options when appropriate.
  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