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CT Lower Extremity Without Contrast

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

A CT scan uses X-rays to create detailed images of the leg, ankle, or other lower-extremity structures without IV contrast dye.

Quick summary

["This scan provides detailed images of the lower extremity to evaluate bones and other tissues without contrast dye."]

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

Key facts at a glance

LOINC
30625-8
Short code
CT LE WO contr
Synonyms
CT LE 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
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 lower-extremity CT scan uses X-rays and a computer to create detailed cross-sectional images of the leg, knee, ankle, foot, or nearby soft tissues. “Without contrast” means no IV contrast dye is injected for the scan.

Why might I need this test?

Your clinician may order this scan to evaluate a suspected fracture, joint injury, bone abnormality, infection, or a mass that is not clearly visible on standard X-rays. It may also be used to guide treatment or further testing.

How is the test performed?

You will lie on a padded table while the CT scanner rotates around the area being examined. The scan is generally painless and usually takes only a few minutes, although the total visit may take longer.

How do I prepare for the test?

Fasting is usually not required, but follow the instructions provided by your imaging center. Remove metal objects, tell the technologist if you are pregnant or may be pregnant, and inform the care team about any prior reaction to contrast dye or other relevant medical conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lower-extremity CT without contrast

Frequently asked questions

Does this CT scan use contrast dye?
No. “Without contrast” means iodinated contrast dye is not injected. Some unrelated types of CT imaging do require contrast, so confirm the order if you are unsure.
Is a CT scan painful?
The scan itself is usually painless. You may feel brief pressure or discomfort from the scanner, and the technologist can explain positioning options beforehand.
How soon will the results be available?
A radiologist typically interprets the images and sends a report to your ordering clinician. The timing for you to receive or discuss the results varies by the imaging center and your care team.
  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