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CT Scan of an Extremity with Intravenous Contrast

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

A CT scan uses X-rays and an intravenous contrast dye to create detailed images of an arm, leg, or other extremity.

Quick summary

["This scan provides detailed images of bones and surrounding tissues and may help identify injuries or other abnormalities."]

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

Key facts at a glance

LOINC
24691-8
Short code
CT Extr W contr IV
Synonyms
CT Extr 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?

A CT scan of an extremity uses X-rays and a computer to create detailed cross-sectional images of the area being examined. Intravenous contrast is a special dye that is injected into a vein to improve the visibility of blood vessels and soft tissues.

Why might I need this test?

Your clinician may order this scan to evaluate a suspected fracture, joint injury, infection, tumor, or another problem involving bones, muscles, blood vessels, or soft tissues. It can also help guide treatment or procedures.

How is the test performed?

You will lie on the CT table while the scanner takes X-ray images from different angles. The contrast dye is usually injected through a vein in your arm or hand, and the scan itself generally takes only a short time.

How do I prepare for the test?

Follow your imaging center's instructions, as fasting or special medication instructions may be needed. Tell the care team about any contrast allergy, kidney disease, pregnancy, or medicines you take, including metformin, before the scan.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CT Extremity with IV Contrast

Frequently asked questions

Will I feel the contrast dye?
The injection may feel like a brief pinch, and the dye can create a warm flushing sensation. Tell the technologist if you develop significant discomfort, itching, or breathing difficulty.
Is this test the same as an X-ray?
No. A standard X-ray creates one or two flat images, while CT uses multiple X-ray measurements to create detailed cross-sectional images. Contrast may make certain tissues easier to see in either type of imaging.
How soon will I receive the results?
A radiologist usually reviews the images and provides a report to your ordering clinician. The timing for discussing the results depends on your clinician's process and the urgency of the examination.
  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