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CT Sacrum and Coccyx with Intravenous Contrast

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

A CT scan that uses injected contrast to create detailed images of the lower spine, including the sacrum and coccyx.

Quick summary

["This scan evaluates the sacrum and tailbone for injuries and other structural or abnormal findings."]

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

Key facts at a glance

LOINC
82704-8
Short code
CT Sacrum+Coccyx W contr IV
Synonyms
CT 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
ct
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 CT scan of the sacrum, a triangular bone at the base of the spine, and the coccyx, commonly called the tailbone. Intravenous contrast is injected into a vein to improve the detail of the images.

Why might I need this test?

The test may be ordered to evaluate tailbone or lower-spine pain, trauma, suspected fractures, infection, or a mass. It can also help clarify abnormalities found during an earlier examination or imaging study.

How is the test performed?

You will lie on a CT table while the scanner takes pictures from different angles. Contrast is given through an intravenous line, and the scan is generally painless, although the injection may cause a brief warm or cool sensation.

How do I prepare for the test?

Follow the imaging center's instructions about eating, drinking, and taking medications. Tell the care team if you are pregnant, may be pregnant, have kidney disease, or have had a serious reaction to contrast; the test may need to be modified or postponed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings may include fractures, alignment problems, degenerative changes, infection, cysts, or other masses involving the sacrum or coccyx. The radiologist interprets the images in the context of your symptoms and examination, and your doctor discusses the results and any recommended follow-up.

Short name

CT Sacrum/Coccyx with IV Contrast

Frequently asked questions

Is this the same as a routine tailbone X-ray?
No. CT provides cross-sectional images and can show fractures and surrounding soft tissues more clearly than a standard X-ray, particularly when contrast is used.
Is the intravenous contrast necessary?
Contrast may help evaluate inflammation, infection, blood vessels, or masses. The ordering clinician and imaging center determine whether contrast should be used for the specific examination.
Will I know the results right after the scan?
A radiologist usually prepares the report after the scan, and your ordering clinician reviews it and explains the findings. Urgent findings may be communicated more quickly.
  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