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X-Ray Tomography of Both Knees Without Contrast

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

X-ray tomography creates detailed cross-sectional images of both knees without injected contrast material.

Quick summary

["This imaging test evaluates the bones and joint structures of both knees without the use of contrast material."]

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

Key facts at a glance

LOINC
39359-5
Short code
XR tomo Kdny-Bl WO contr
Synonyms
XR tomo Kdny-Bl 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
xr-tomography
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 an X-ray tomography, also called computed tomography (CT), that produces detailed images of both knee joints. It is performed without injecting contrast material.

Why might I need this test?

It may be used to evaluate knee pain, injury, swelling, or difficulty walking. It can show fractures, bone abnormalities, cartilage or joint changes, alignment problems, and some soft-tissue findings.

How is the test performed?

You will lie on a scanning table while an X-ray device rotates around your knees and creates computer-generated images. The scan is painless, but you must remain still during the examination.

How do I prepare for the test?

No contrast material is used, so there is generally no special preparation or waiting period afterward. Wear comfortable clothing, remove metal objects near the knees when instructed, and tell the imaging staff if you are pregnant or unable to remain still.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings may indicate fractures, osteoarthritis, cartilage or joint-space changes, bone lesions, or problems with knee alignment. The images are interpreted together with your symptoms, medical history, examination, and other imaging tests.

Short name

Imaging of both knees without contrast

Frequently asked questions

Is contrast material used for this knee scan?
No. This test is performed without injected contrast material, so there is no need for an iodinated contrast injection or related contrast-related waiting period.
Does the test examine both knees?
Yes. Images are obtained of both knees, even if one knee is causing more symptoms.
Is the test painful?
The scan itself is generally painless. You may feel brief pressure from the scanning equipment, and staying still is important for clear images.
  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