Magnetic Resonance Imaging (MRI) of the Head With and Without Intravenous Contrast
This imaging test creates detailed pictures of the brain and nearby structures, first without contrast and then after an IV contrast agent is given.
["A head MRI with and without contrast helps doctors examine the brain for structural or vascular abnormalities."]
Key facts at a glance
- LOINC
- 36847-2
- Short code
- MRA Head vv WO+W contr IV
- Synonyms
- MRA Head vv 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?
This test is a magnetic resonance imaging (MRI) examination of the head. It produces detailed pictures of the brain and surrounding tissues and may include images taken before and after an intravenous contrast agent is administered.
Why might I need this test?
A head MRI may be ordered to investigate symptoms such as severe headache, weakness, seizures, vision changes, confusion, or head injury. It can help evaluate the brain for conditions including stroke, tumors, infection, inflammation, fluid buildup, and other structural abnormalities.
How is the test performed?
You will lie on a movable table inside an MRI scanner, which uses a strong magnetic field and radio waves to create images. If contrast is included, it is usually given through a small intravenous line in your arm; the scan may take longer and you may be asked to remain still.
How do I prepare for the test?
Follow the imaging center's instructions, as fasting may or may not be required. Tell the care team if you have metal implants, a pacemaker, kidney disease, a prior contrast reaction, or possibly being pregnant, because these factors can affect safety or the choice of contrast.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal MRI findings may indicate a condition affecting the brain, such as a tumor, stroke, bleeding, infection, inflammation, or abnormal fluid accumulation. The radiologist will interpret the images in the context of your symptoms and examination, and additional testing may be needed to determine a diagnosis.
Short name
Head MRI with and without IV contrast
Frequently asked questions
What is the difference between MRI with and without contrast?
Is IV contrast safe?
Will I need to stay overnight or undergo another procedure?
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