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CT Angiography of the Thoracic Aorta Without Contrast

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

A CT scan creates detailed images of the thoracic aorta using X-rays and computer technology, without injecting IV contrast.

Quick summary

["This scan evaluates the thoracic aorta for conditions such as aneurysm, dissection, and calcification without IV contrast."]

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

Key facts at a glance

LOINC
69119-6
Short code
CTA TA WO contr
Synonyms
CTA TA WO contr
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 scan of the thoracic aorta, the main artery carrying blood from the heart through the chest. It uses X-rays and computer processing to create detailed images without injecting intravenous contrast dye.

Why might I need this test?

It may be ordered to evaluate an aortic aneurysm, suspected dissection, artery wall calcification, or other changes involving the thoracic aorta. It may also be used to monitor an existing finding or help plan other procedures.

How is the test performed?

You will lie on a motorized table while a CT scanner rotates around your body and takes multiple X-ray images. No contrast dye is injected for this version of the scan.

How do I prepare for the test?

Fasting is usually not required, but the imaging facility may provide specific instructions. Tell the technologist if you are or could be pregnant, and follow all preparation directions provided before the appointment.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Thoracic Aorta CT Without Contrast

Frequently asked questions

Will I receive IV contrast for this scan?
No. This version of the CT scan is performed without injected contrast dye, although the facility may still need an IV line for routine medications or emergency access.
Does this test use radiation?
Yes. CT imaging uses a small amount of ionizing radiation, and the technologist will position you to limit the exposed area when possible.
Can this scan rule out an aortic dissection?
A no-contrast CT can help identify many aortic abnormalities, but symptoms and clinical circumstances also guide evaluation. A radiologist will determine whether additional imaging is 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 16, 2026. · Read our editorial policy