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Magnetic Resonance Imaging (MRI) of the Sacrum Without Contrast

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

An MRI that creates detailed images of the sacrum and nearby lower spine and pelvic structures without using contrast dye.

Quick summary

["This MRI evaluates the sacrum and nearby spinal structures without injecting contrast dye."]

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

Key facts at a glance

LOINC
36521-3
Short code
MR Sacrum WO contr
Synonyms
MR Sacrum 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) of the sacrum uses a strong magnetic field and radio waves to create detailed pictures. The sacrum is the triangular bone at the base of the spine, between the hips.

Why might I need this test?

This test may help evaluate lower back or pelvic pain, sacral injury, suspected infection, or a bone or spinal mass. It can also show changes involving the sacrum, nearby spinal cord, and nerve roots.

How is the test performed?

You will lie on a padded table that slides into an MRI scanner. The technologist may ask you to remain still and may position a coil over the area being examined. The scan usually takes 20 to 60 minutes.

How do I prepare for the test?

Follow the facility's instructions and tell the technologist if you have metal implants, a pacemaker, or other devices. If you feel anxious in enclosed spaces, ask whether medication or other accommodations are available.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

MRI of the sacrum without contrast

Frequently asked questions

Does this MRI use contrast dye?
No. This study is performed without intravenous contrast, so you generally will not receive an injection for the scan.
Does an MRI use radiation?
No. MRI uses magnetic fields and radio waves rather than ionizing radiation.
Will I be able to move during the scan?
You will need to remain still while images are being recorded. The technologist will communicate with you through a speaker or intercom, and some positions may feel confined.
  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