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CT Angiography, Right Carotid Artery, With Intravenous Contrast

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

A contrast-enhanced CT scan examines the right carotid artery and nearby blood vessels in the neck.

Quick summary

["This scan uses IV contrast to assess the right carotid artery for narrowing, blockage, or other vascular abnormalities."]

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

Key facts at a glance

LOINC
79073-3
Short code
CTA Hrt+CA W contr IV
Synonyms
CTA Hrt+CA 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?

This is a CT angiogram, also called a CTA, of the right carotid artery. Intravenous contrast is used to make the artery and other nearby blood vessels easier to see on CT images.

Why might I need this test?

It may be ordered to evaluate symptoms such as weakness, numbness, trouble speaking, vision changes, or severe neck pain. It is also used to monitor known artery disease or assess the appearance of a lump, narrowing, or abnormal blood vessel.

How is the test performed?

You lie on a CT table while an IV line delivers contrast and the scanner takes many images. The scan is generally quick, although staying still is important, and a radiologist interprets the results.

How do I prepare for the test?

Follow the instructions provided by the imaging facility. Tell the care team about any prior contrast reaction, kidney disease, thyroid disease, or medications that may affect kidney function. Fasting is not always required but may be requested for this examination.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

The scan can identify significant narrowing, blockage, dissection, aneurysm, or plaque in the right carotid circulation. Abnormal findings may help explain symptoms involving the brain or right side of the body and may guide vascular or stroke-prevention treatment. Results should be interpreted by your clinician in combination with your symptoms, medical history, and other tests.

Short name

Right carotid CT angiogram

Frequently asked questions

Is this the same as a carotid ultrasound?
No. A carotid ultrasound uses sound waves, while this test uses CT and IV contrast to create detailed images of the artery.
Is the CT scan painful?
The scan itself is usually not painful. The IV injection may cause a brief warm sensation or pressure, and some people feel mildly anxious in the scanner.
Will I be able to drive home afterward?
Many people can leave without restrictions, but guidance may differ if you received sedating medication. If contrast was injected through a hand or arm vein, you may be observed briefly and instructed to drink fluids.
  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