Computed Tomography (CT) Scan of the Knee with Intravenous Contrast
A CT scan uses X-rays and IV contrast to create detailed images of the knee, including the bones, cartilage, and surrounding soft tissues.
["This imaging test can help identify injuries and structural changes in the knee that may not be clearly visible on plain X-rays."]
Key facts at a glance
- LOINC
- 36222-8
- Short code
- CT Knee W contr IV
- Synonyms
- CT Knee 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 the knee uses X-rays taken from different angles to create detailed cross-sectional images. Intravenous contrast, given through a vein, may help improve the visibility of certain tissues and abnormalities.
Why might I need this test?
Your clinician may order this test to evaluate a knee injury, persistent pain, swelling, or difficulty walking. It can provide detailed information about fractures, cartilage and bone changes, infection, or other abnormalities.
How is the test performed?
You will lie on a table that moves through a CT scanner while X-ray images are taken. If contrast is required, it is usually injected into a vein in your arm before the scan and may cause a brief warm or flushing sensation.
How do I prepare for the test?
Follow your clinician's instructions, and tell the imaging staff if you have previously had a serious reaction to contrast, have kidney disease, are pregnant or may be pregnant, or take medicines such as metformin. Remove metal objects and follow the facility's instructions for clothing and movement during the scan.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal findings may include fractures, cartilage or bone changes, joint narrowing, fluid collections, infection-related changes, or masses. The scan should be interpreted alongside your symptoms, physical examination, and other imaging or laboratory tests because some findings may have more than one cause.
Short name
CT knee with IV contrast
Frequently asked questions
Is a CT scan of the knee the same as an X-ray?
Does IV contrast always cause side effects?
Will the scan diagnose the cause of my knee pain?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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