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Computed Tomography (CT) Scan of the Knee Without Contrast

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

A CT scan creates detailed images of the knee to evaluate injuries, bone abnormalities, and joint or soft-tissue problems without injected contrast dye.

Quick summary

["This imaging test can identify fractures and other structural problems in the knee that may not be clearly visible on standard X-rays."]

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

Key facts at a glance

LOINC
36505-6
Short code
CT Knee WO contr
Synonyms
CT Knee 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 knee CT scan uses X-rays and a computer to create detailed cross-sectional images of the bones, joints, and nearby soft tissues. The “without contrast” designation means that contrast dye is not injected for the scan.

Why might I need this test?

A CT scan may be recommended for persistent knee pain or swelling, a suspected complex fracture, evaluation after an injury, or when the cause of joint symptoms is not clear from an examination or standard X-ray.

How is the test performed?

You will lie on a padded table while a CT scanner rotates around the affected knee. The scan is generally painless and usually takes only a short time, although you may be asked to remain still or hold your leg in a specific position.

How do I prepare for the test?

No special preparation is usually required for a CT scan without contrast. Wear comfortable clothing without metal near the knee, remove jewelry if requested, and tell the imaging staff if you are or might be pregnant.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CT Knee Without Contrast

Frequently asked questions

Is a CT scan of the knee the same as an X-ray?
Both use X-rays, but CT creates many cross-sectional images and shows bone and soft-tissue detail more clearly. Your clinician chooses CT when greater detail is needed.
Will I receive contrast dye?
No. This test is specified as a CT scan without contrast, so contrast dye is not injected. If another type of CT is needed, the imaging center will explain the additional steps.
Is the CT scan painful?
The scan itself is not painful, although the table and scanner may feel cramped. Tell the staff if you have pain, limited mobility, anxiety, or any other concern that could make the examination difficult.
  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