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CT Pulmonary Angiogram (Chest CT Angiography) with Intravenous Contrast

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

A chest CT scan using intravenous contrast to examine the blood vessels in the lungs, most often to look for a pulmonary embolism.

Quick summary

["This imaging test helps detect a blood clot in the lungs and may identify other causes of chest pain or breathing problems."]

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

Key facts at a glance

LOINC
88322-3
Short code
CT Chest + CTA PA for PE W contr IV
Synonyms
CT Chest + CTA PA for PE 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-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?

A CT pulmonary angiogram is a specialized X-ray-based CT scan of the blood vessels in your lungs. Intravenous contrast is used to make the vessels easier to see, and the images can show whether a blood clot is blocking blood flow through the lungs.

Why might I need this test?

Your clinician may order this test if you have symptoms such as sudden shortness of breath, chest pain, coughing, or blood in the sputum. It may also be used when there is concern for a blood clot that traveled from another part of the body to the lungs.

How is the test performed?

You lie on a table that moves through the CT scanner. Contrast is usually injected into a vein in your arm, and the scanner takes several rapid images of your chest. A radiologist reviews the images and sends the results to your ordering clinician.

How do I prepare for the test?

Follow your clinician's instructions, which may include avoiding food or drinks for a short period before the scan. Tell the care team if you are pregnant or may be pregnant, have kidney problems, or have had an allergic reaction to contrast. You may also be asked about other medicines, including blood thinners.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CT pulmonary angiogram

Frequently asked questions

Does a CT pulmonary angiogram use radiation?
Yes. It uses a small amount of ionizing radiation, along with intravenous contrast, to create detailed images of the lungs and their blood vessels.
Is the CT pulmonary angiogram the same as a routine chest CT?
No. A pulmonary angiogram is a specialized CT study focused on the blood vessels supplying the lungs, usually performed with contrast to evaluate for a pulmonary embolism.
What should I do if I have a contrast allergy or kidney disease?
Tell your clinician before the appointment. The care team can review the allergy or kidney condition and determine whether special precautions, an alternative contrast strategy, or a different test 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