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Magnetic Resonance Imaging of the Sacrum and Sacroiliac Joints Without Contrast

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

An MRI that creates detailed images of the sacrum and sacroiliac joints without injecting contrast dye.

Quick summary

["This MRI evaluates the sacrum and sacroiliac joints for pain, inflammation, injury, or other structural abnormalities."]

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

Key facts at a glance

LOINC
91596-7
Short code
MR Sacrum and SIJ WO contr
Synonyms
MR Sacrum and SIJ 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?

This is a magnetic resonance imaging (MRI) examination of the sacrum, the triangular bone at the base of the spine, and the sacroiliac joints that connect the spine to the pelvis.

Why might I need this test?

A clinician may order this MRI to investigate lower back or pelvic pain, evaluate the sacroiliac joints, or look for fractures, inflammation, infection, or other structural changes.

How is the test performed?

You will lie on a table while a large MRI scanner uses magnetic fields and radio waves to produce images. The scan usually takes 20 to 60 minutes, although the exact time varies.

How do I prepare for the test?

Follow the instructions provided by the imaging center. Remove jewelry, glasses, hearing devices, and other metal items, and tell the care team if you have implants, a pacemaker, or a history of claustrophobia.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

MRI of sacrum and sacroiliac joints

Frequently asked questions

Is contrast dye used in this MRI?
No. This examination is specified as being performed without intravenous contrast, so no contrast dye is typically injected.
Does the MRI use radiation?
No. MRI uses magnetic fields and radio waves rather than ionizing radiation.
Will I need to lie still during the scan?
Yes. The care team will ask you to remain still and may ask you to hold your breath briefly during certain images. The scanner may make loud knocking or ringing sounds.
  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