Computed Tomography Angiography of the Chest Vessels — With or Without Intravenous Contrast
A CT scan used to examine blood vessels in the chest, such as the pulmonary arteries and thoracic aorta, sometimes using IV contrast.
["This imaging test helps identify blockages, aneurysms, or other abnormalities in blood vessels of the chest."]
Key facts at a glance
- LOINC
- 30804-9
- Short code
- CTA Chest ves WO+W contr IV
- Synonyms
- CTA Chest ves 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?
Computed tomography angiography, or CTA, uses X-rays and a computer to create detailed pictures of blood vessels in the chest. The study may be performed with or without an intravenous contrast dye, depending on the area being evaluated and the purpose of the test.
Why might I need this test?
A chest CTA may be used to evaluate suspected pulmonary blood clots, narrowing of major arteries, aortic aneurysms, or aortic dissection. It may also help assess blood vessels or surrounding structures when other imaging findings need further evaluation.
How is the test performed?
You lie on a table that moves through a CT scanner while X-ray images are taken. If contrast is used, it is given through an intravenous line in your arm or hand, and the scan is timed to capture the blood vessels clearly.
How do I prepare for the test?
Follow the instructions provided by the imaging center. Tell the care team about any prior reaction to iodinated contrast, kidney disease, relevant allergies, pregnancy possibility, or implanted medical devices. Remove metal objects and inform the team if you cannot remain still during the scan.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal findings may indicate a blood clot, blocked or narrowed vessel, aneurysm, dissection, or another structural abnormality involving the chest vessels. The clinical meaning depends on the vessels examined, the use of contrast, and the person's symptoms and medical history. A radiologist interprets the images, and the results are usually reviewed together with other tests by the ordering clinician.
Short name
Chest CT angiogram
Frequently asked questions
Is a chest CTA the same as a routine chest CT?
Is intravenous contrast always used?
What should I do if I have had a reaction to contrast dye?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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