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CT Angiography of the Head and Neck with Intravenous Contrast

Published: August 9, 2026Updated: August 17, 2026

Uses contrast-enhanced CT to examine blood vessels in the head and neck, including the carotid and vertebral arteries.

Quick summary

["This scan can help identify narrowing, blockage, or other abnormalities in the major arteries of the head and neck."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
37498-3
Short code
CTA Head+Neck Ves W contr IV
Synonyms
CTA Head+Neck Ves W contr IV
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
22
Ref high
198
Critical range
— – 10000 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ct-angio
CPT
82553
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?

Head and neck CT angiography is an imaging test that uses intravenous contrast and CT scans to show the blood vessels in the head and neck. It can provide detailed images of major arteries, including the carotid and vertebral arteries.

Why might I need this test?

This test may be ordered to investigate symptoms such as sudden weakness, speech or vision changes, dizziness, or neck pain. It may also be used to evaluate the arteries before certain procedures or to monitor a known vascular condition.

How is the test performed?

You will lie on a CT scanner table while an intravenous line is placed and contrast is injected. The scanner takes several images as you move through the scanner, usually briefly, and a radiologist reviews the results.

How do I prepare for the test?

Follow the instructions provided by the imaging center, especially any instructions about eating, drinking, and taking medicines. Tell the care team if you have previously had a reaction to iodinated contrast, have kidney disease, are pregnant or may be pregnant, or have other significant medical conditions.

Reference range

Adult males: 22-198 U/L; Females: 22-198 U/LN/A

Specimen: serum

No special preparation required. Inform provider of any chest pain or symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Head and Neck CT Angiography

Frequently asked questions

Is this the same as a routine CT scan?
No. CT angiography is specifically designed to highlight blood vessels using intravenous contrast and timed image acquisition.
Does the test require an IV line?
Yes. Iodinated contrast is usually injected through a vein to make the arteries easier to see.
What should I do if I have reacted to contrast before?
Tell the ordering clinician and imaging center before the appointment. They can review the prior reaction and determine what precautions or alternative imaging are needed.
  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 17, 2026. · Read our editorial policy