MRI of the Sacrum and Coccyx with Intravenous Contrast
An MRI uses magnetic fields and detailed images to examine the sacrum, coccyx, and nearby tissues. Intravenous contrast may be given to improve image detail.
["This MRI evaluates the lower spine and surrounding tissues, often using an intravenous contrast agent."]
Key facts at a glance
- LOINC
- 36247-5
- Short code
- MR Sacrum+Coccyx W contr IV
- Synonyms
- MR Sacrum+Coccyx W contr IV
- 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) study of the sacrum, which connects the lower spine to the pelvis, and the coccyx, or tailbone. Intravenous contrast may be administered to make certain tissues and abnormalities easier to see.
Why might I need this test?
The test may be ordered to investigate persistent lower back or tailbone pain, trauma, suspected fracture, infection, a mass, or symptoms caused by pressure on nearby nerves. It can also help evaluate conditions affecting the sacrum, coccyx, or surrounding soft tissues.
How is the test performed?
You will lie on a padded table while the MRI machine creates images of the lower spine. If contrast is used, it is usually given through a vein in your arm; the scan may take 30 to 60 minutes, although timing varies.
How do I prepare for the test?
Follow the instructions provided by the imaging center, including telling the staff about implanted devices, metal objects, kidney disease, or prior contrast reactions. Remove jewelry and other metal items when directed, and ask the care team whether you can take your usual medicines.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal findings may include a fracture, degenerative changes, infection, a cyst or other mass, inflammation, or pressure on nearby nerves. The results are interpreted together with your symptoms, medical history, physical examination, and other tests because some findings may have more than one cause.
Short name
MRI sacrum and coccyx with contrast
Frequently asked questions
Is this MRI painful?
Why might I need intravenous contrast?
Can I have this test if I am pregnant or have metal in my body?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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