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CT Angiography, Upper Extremity (Right or Left) — With and Without Intravenous Contrast

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

A CT scan uses injected contrast to examine the arteries of an upper limb and identify narrowing, blockage, or other vascular abnormalities.

Quick summary

["This scan creates detailed images of the upper-extremity arteries to help evaluate blood flow and abnormalities."]

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

Key facts at a glance

LOINC
46312-5
Short code
CTA UE ves-L WO+W contr IV
Synonyms
CTA UE ves-L WO+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, or CTA, is an imaging test that uses a CT scanner and injected contrast to show the arteries of an upper limb. The scan may include images obtained before and after contrast is given.

Why might I need this test?

A clinician may order this scan to investigate reduced blood flow, swelling, pain, numbness, or a suspected blood clot. It may also be used to evaluate vessels before a procedure or to assess conditions such as an aneurysm or arterial dissection.

How is the test performed?

You lie on a CT table while the scanner takes pictures of the arm. Contrast is usually given through a vein in the arm, and the scan takes only a few minutes, although the overall visit may take longer.

How do I prepare for the test?

Follow the instructions provided by the imaging center, especially any directions about IV contrast, medications, or eating. Tell the care team about contrast allergy, kidney disease, pregnancy, and any conditions that affect circulation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings may indicate narrowing or blockage of an artery, an aneurysm, arterial dissection, or another problem affecting blood flow. The images are interpreted by a radiologist and should be considered together with symptoms, examination findings, and other tests.

Short name

Upper Extremity CT Angiography

Frequently asked questions

Does this test require a blood draw?
No. IV contrast is delivered through a small IV line so that the arteries can be seen clearly on the CT images.
What if I am allergic to iodine or contrast?
Tell the imaging center before the appointment. The team can review the allergy, determine whether contrast can be used safely, and discuss possible alternatives.
Is the CT angiogram the same as a CT scan without contrast?
No. CT angiography specifically evaluates blood vessels and usually requires IV contrast to produce the most useful 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