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CT Angiography of the Aorta — With or Without IV Contrast

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

A CT scan uses X-rays to create detailed images of the aorta. Intravenous contrast may be used to improve visualization of the vessels.

Quick summary

["This imaging test helps evaluate the aorta for narrowing, enlargement, or other structural abnormalities."]

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

Key facts at a glance

LOINC
78032-0
Short code
CTA T+A.Ao+RO v-Bl WO+W contr IV
Synonyms
CTA T+A.Ao+RO v-Bl 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 uses X-rays and computer technology to produce detailed pictures of the aorta, the main artery carrying blood from the heart. Your care team may perform the scan with or without intravenous contrast, depending on the information needed.

Why might I need this test?

This test may be ordered to evaluate an aneurysm, narrowing, dissection, or other problem involving the aorta. It may also be used to assess the aorta before or after a procedure or to help investigate symptoms such as sudden chest, back, or abdominal pain.

How is the test performed?

You will lie on a table while a CT scanner rotates around you and takes images. If contrast is used, it is given through a vein in your arm, and the images are taken during and after the injection. The scan usually takes only a short time.

How do I prepare for the test?

Follow the instructions provided by the imaging center. Tell the care team if you have previously had a serious reaction to contrast, are pregnant or might be pregnant, or have kidney disease. You may also need to discuss medicines such as metformin before receiving contrast.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Aortic CT angiography

Frequently asked questions

Is IV contrast always used?
No. The order may specify CT imaging with or without contrast, and contrast is used only when it is needed or considered safe.
What should I do if I have had a reaction to contrast?
Tell the imaging center before the appointment, including the type and severity of the earlier reaction. This may allow the team to use an alternative contrast or modify the examination.
Does this test involve radiation?
Yes. CT imaging uses X-ray radiation, although the exposure during a single examination is generally limited and controlled.
  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