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CT Angiography, Upper/Lower Extremity — With Intravenous Contrast

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

A CT scan uses X-rays and IV contrast to examine blood vessels in the upper and/or lower extremities for narrowing, clots, or other vascular problems.

Quick summary

["This imaging test helps identify problems involving the blood vessels of an arm or leg."]

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

Key facts at a glance

LOINC
89722-3
Short code
CTA UE vv-L W contr IV
Synonyms
CTA UE vv-L 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?

CT angiography is an imaging test that uses X-rays and intravenous contrast to view blood vessels in an arm or leg. It may be used to evaluate both arteries and veins, depending on the specific examination ordered.

Why might I need this test?

Your clinician may order it to investigate swelling, pain, numbness, or reduced circulation in an extremity. It can also help evaluate a suspected blood clot, narrowing of a vessel, an aneurysm, or the blood supply before a procedure.

How is the test performed?

Contrast material is given through a vein in your arm, and X-ray images are taken as the scanner moves around the area being examined. The images are then reviewed by a radiologist and sent to your ordering clinician.

How do I prepare for the test?

Follow the imaging center's instructions, which may include avoiding food for a period before the appointment. Tell the staff about any contrast allergy, kidney disease, pregnancy, or breastfeeding, because these factors may affect the procedure or contrast selection.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings may indicate a blood clot, narrowed or blocked vessel, an aneurysm, or another circulation problem. The location and importance of any finding depend on your symptoms and medical history. Your ordering clinician will interpret the scan in the context of your examination and other tests.

Short name

CT angiography with IV contrast

Frequently asked questions

Does this test use a blood draw?
No. Contrast material is delivered through a small intravenous line so that the blood vessels can be seen more clearly on the CT images.
Why do I need intravenous contrast?
Contrast helps highlight blood vessels and makes narrowing, blockage, or other vascular abnormalities easier to identify. The scan may still include non-contrast images as part of the examination.
What happens if the test is abnormal?
Your clinician may recommend additional imaging, medication, or another treatment based on the finding. A blood clot or significant vessel problem may require prompt or urgent evaluation.
  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