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CT Angiography, Carotid Arteries — Intravenous Contrast

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

A CT scan that uses injected contrast to show the carotid arteries in the neck and assess narrowing, blockage, or other abnormalities.

Quick summary

["This scan creates detailed images of the neck arteries that supply blood to the brain."]

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

Key facts at a glance

LOINC
36146-9
Short code
CTA Carotid a W contr IV
Synonyms
CTA Carotid a 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?

Carotid artery CT angiography, or CTA, is an imaging test that uses computed tomography and intravenous contrast to create detailed pictures of the carotid arteries. These arteries carry oxygen-rich blood from the neck to the brain.

Why might I need this test?

Your clinician may order this test to evaluate suspected narrowing or blockage of the carotid arteries, especially after symptoms such as a sudden weakness, trouble speaking, dizziness, or vision changes. It may also be used to plan treatment or monitor a known artery condition.

How is the test performed?

You will lie on a CT table while an IV line is placed and contrast is injected into a vein. The scanner then takes several rapid images, usually without requiring you to hold your breath. The examination is generally painless, and sedation is not usually needed for adults.

How do I prepare for the test?

Follow your imaging center's instructions about eating, drinking, and medications. Tell the care team if you have kidney disease, a previous serious reaction to iodinated contrast, or are pregnant or may be pregnant, because these factors may affect the examination or require special precautions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Carotid artery CT angiography

Frequently asked questions

Is carotid artery CT angiography the same as a routine CT scan?
No. CTA is a specialized CT examination performed after contrast is injected through an IV so that blood vessels can be seen more clearly.
Does the test use radiation?
Yes. CTA uses a small amount of ionizing radiation, and intravenous contrast may cause a brief warm or flushing sensation when it enters the vein.
How soon will I receive the results?
A radiologist usually prepares the report within a timeframe determined by the imaging center. Your ordering clinician can tell you when the results are expected and discuss them with you.
  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