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Magnetic Resonance Imaging (MRI) of the Kidney Without Contrast

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

MRI creates detailed images of the kidneys using magnetic fields and radio waves, without injected contrast dye or ionizing radiation.

Quick summary

["A kidney MRI without contrast produces detailed images to evaluate kidney anatomy and possible abnormalities."]

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

Key facts at a glance

LOINC
43773-1
Short code
MR Kidney WO contr
Synonyms
MR Kidney 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, or MRI, uses magnetic fields and radio waves to create detailed pictures of the kidneys and surrounding tissues. In this version, no intravenous contrast dye is used.

Why might I need this test?

A kidney MRI may be ordered to investigate unexplained pain, a suspected mass, stones, urinary obstruction, infection, cystic disease, or changes in kidney structure or function.

How is the test performed?

You will lie on a padded table that moves into a large MRI machine. The scanner produces a series of images, and you may be asked to remain still or hold your breath briefly. The procedure does not use X-rays.

How do I prepare for the test?

Follow the imaging center's instructions and tell the technologist about metal implants, medication patches, pregnancy, or a history of claustrophobia. You may be asked to remove jewelry, watches, cards, and other metal or electronic items.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings may indicate a kidney mass, cyst, stone, obstruction, infection, or reduced function. MRI results should be interpreted together with symptoms, examination findings, and other laboratory or imaging tests.

Short name

Kidney MRI without contrast

Frequently asked questions

Does a kidney MRI without contrast use radiation?
No. MRI uses magnetic fields and radio waves rather than ionizing radiation, and this test does not require injected contrast dye.
Is the MRI scan painful?
The scan itself is generally painless, although the confined space, loud noises, and need to remain still may feel uncomfortable. Tell the technologist if you feel anxious or claustrophobic.
Why might a contrast-enhanced MRI be chosen instead?
Contrast dye can make certain blood vessels and tissues easier to see, which may help evaluate specific abnormalities. 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