Computed Tomography Venography, Right Lower Extremity — With Intravenous Contrast
A CT scan with IV contrast that images the veins of the right lower extremity to look for clots, narrowing, or other venous abnormalities.
["This test uses CT and intravenous contrast to evaluate the veins of the right leg for clots and other circulation problems."]
Key facts at a glance
- LOINC
- 36825-8
- Short code
- CTA LE vv-R W contr IV
- Synonyms
- CTA LE vv-R 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-angio
- 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?
Right lower-extremity CT venography is a CT scan that creates detailed pictures of the veins in the right leg. Intravenous contrast is used to help show blood flow and may reveal clots, narrowed veins, or abnormal collateral veins.
Why might I need this test?
The test may be ordered for unexplained leg swelling, pain, redness, or suspected deep-vein thrombosis. It may also be used to assess venous anatomy before a procedure, to plan treatment for a clot, or to investigate other circulation problems.
How is the test performed?
You will usually lie on a table while an IV line is placed and contrast is injected. The scanner then takes several X-ray images of the right leg and nearby areas. The examination generally takes less than 30 minutes, although visit times vary.
How do I prepare for the test?
Tell the imaging team about any contrast allergy, kidney disease, pregnancy, or medicines such as metformin that you take. Follow the facility's instructions about eating, drinking, and taking medicines, and remove metal objects and jewelry before the scan.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
An abnormal result may show a blood clot, partial or complete venous obstruction, or collateral veins forming around a blockage. These findings can help guide anticoagulation, procedures, or other treatment. If you have sudden one-sided leg swelling, pain, redness, or warmth, seek prompt medical evaluation even before this scan is completed.
Short name
Right Leg CT Venography
Frequently asked questions
Is this the same as a CT scan of the right leg arteries?
Why is intravenous contrast used?
Is ultrasound used instead?
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