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Magnetic Resonance Imaging (MRI) of the Head Without Contrast

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

A noncontrast MRI creates detailed images of the brain and nearby head structures using magnetic fields and radio waves.

Quick summary

["This head MRI produces detailed images without injecting an IV contrast dye."]

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

Key facts at a glance

LOINC
36482-8
Short code
MR Hrt WO contr
Synonyms
MR Hrt 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
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?

A head MRI is an imaging test that produces detailed pictures of the brain, skull, and surrounding structures. This version is performed without intravenous contrast dye.

Why might I need this test?

A head MRI may be used to investigate headaches, dizziness, weakness, seizures, vision changes, head injury, or suspected conditions affecting the brain. It can also help monitor certain diseases or treatments.

How is the test performed?

You will lie on a narrow table that moves into a large scanner. The machine uses magnetic fields and radio waves to create images, and you may hear knocking or clicking sounds during the scan.

How do I prepare for the test?

Tell the care team about metal implants, heart devices, piercings, or a possibility of pregnancy. Remove jewelry and other metal objects and follow the facility's instructions about eating, medications, and claustrophobia.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings may include changes involving the brain tissue, blood vessels, skull, or nearby structures, depending on the reason for the MRI. Some findings are not specific to one condition and are interpreted together with symptoms, examination, and other tests.

Short name

Head MRI without contrast

Frequently asked questions

Does a head MRI without contrast use any dye?
No. This examination does not require intravenous contrast dye, although other substances you may already take can occasionally affect image quality.
Is a head MRI painful?
The MRI itself is generally painless. Some people feel anxious in the narrow scanner, but the care team can explain the procedure and may provide options for comfort.
Why might both noncontrast and contrast MRI images be needed?
Noncontrast images often provide a strong baseline view of the brain, while contrast images can highlight inflammation, blood vessels, tumors, or other tissue changes. Your clinician will determine whether both are 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