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Computed Tomography Angiography of Chest Vessels Without Contrast

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

A CT scan that images blood vessels in the chest without iodinated contrast to evaluate vessel anatomy, calcification, and selected abnormalities.

Quick summary

["This imaging test evaluates chest blood vessels without iodinated contrast, although subtle narrowing or small clots may be better assessed with contrast."]

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

Key facts at a glance

LOINC
69084-2
Short code
CTA Chest ves WO contr
Synonyms
CTA Chest ves 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?

Computed tomography angiography, or CTA, uses multiple X-ray images to examine blood vessels in the chest. The version named here is performed without iodinated intravenous contrast.

Why might I need this test?

This test may be ordered to evaluate the aorta and other chest vessels, investigate symptoms such as chest or back pain, or monitor a known vascular condition. A radiologist will also review the lungs and nearby structures visible on the images.

How is the test performed?

You lie on a CT table while the scanner rotates around you. You may be asked to hold your breath briefly so the images are clear. No iodinated contrast is injected for the version specified in the test name, and a radiologist interprets the images.

How do I prepare for the test?

Fasting is usually not required, but follow the imaging center's instructions. Tell the staff if you are pregnant, may be pregnant, or have kidney problems. Do not stop prescribed medicines unless your clinician tells you to do so.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Chest CTA Without Contrast

Frequently asked questions

Does this chest CTA use contrast?
According to the test name, it is performed without iodinated intravenous contrast. Imaging centers should confirm the exact protocol because CTA examinations may sometimes be ordered with contrast.
Is this the same as a routine chest CT?
No. A routine chest CT generally focuses on the lungs and other chest structures, while CTA is designed primarily to evaluate the blood vessels.
Does the test use radiation?
Yes. CT scans use a small amount of ionizing radiation, but the information gained is usually considered worth the risk for an appropriate medical indication.
  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