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Magnetic Resonance Imaging of the Brain Without Contrast

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

A brain MRI creates detailed images using magnetic fields and radio waves without injecting an IV contrast agent.

Quick summary

["This imaging test evaluates the structure and tissues of the brain without the use of IV contrast."]

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

Key facts at a glance

LOINC
36439-8
Short code
MR Brst-R WO contr
Synonyms
MR Brst-R 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?

Magnetic resonance imaging (MRI) uses strong magnetic fields and radio waves to create detailed pictures of the brain. In this version, no intravenous contrast dye is used.

Why might I need this test?

A brain MRI may be ordered to investigate headaches, dizziness, weakness, seizures, vision changes, or signs of a brain disorder. It can also help assess the brain after an injury or suspected stroke.

How is the test performed?

You will lie still inside a scanner while it produces images. The scan usually takes 20 to 60 minutes, although the exact time depends on the examination.

How do I prepare for the test?

Follow the instructions provided by the imaging center. Tell the staff if you have a pacemaker, implanted metal device, pregnancy possibility, or severe claustrophobia, and bring any relevant medical information.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Brain MRI without contrast

Frequently asked questions

Does this test use contrast dye?
No. “Without contrast” means no IV contrast agent is given for this examination, although the MRI machine still makes clicking and other loud noises.
Will I feel anything during the scan?
The scan itself is generally painless. You may feel pressure or mild anxiety while lying in the narrow scanner, and the staff can explain options to help you feel comfortable.
Why might another MRI be performed with contrast?
A contrast-enhanced study can sometimes highlight inflammation, infection, tumors, or blood-vessel abnormalities more clearly. Your clinician will decide whether contrast is needed based on the clinical question.
  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