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CT Scan of the Pulmonary Arteries with Intravenous Contrast

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

A CT imaging test that uses intravenous contrast to examine the pulmonary arteries, most often to look for a pulmonary embolism.

Quick summary

["This scan can identify blood clots blocking the lung arteries and may also reveal other problems affecting the lungs or heart."]

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

Key facts at a glance

LOINC
83292-3
Short code
CT Scapula W contr
Synonyms
CT Scapula W 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
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 an X-ray–based CT scan in which contrast dye is injected into a vein to make the blood vessels in the lungs easier to see. It is primarily used to evaluate the pulmonary arteries for blood clots.

Why might I need this test?

The test may be ordered if you have symptoms of a pulmonary embolism, such as sudden shortness of breath, chest pain, rapid breathing, or coughing up blood. It may also be used to investigate other suspected problems involving the pulmonary blood vessels.

How is the test performed?

You lie on a CT table while an IV line is placed and contrast dye is administered. The scanner takes several rapid images as the dye travels through your blood vessels. The procedure is generally painless, although the IV injection may cause a brief warm or flushing sensation.

How do I prepare for the test?

Follow the imaging center's instructions about eating, drinking, and taking medicines. Tell the care team if you have previously reacted to iodinated contrast, have kidney disease, are pregnant or may be pregnant, or have any implanted medical devices. Do not stop prescribed medicines unless instructed to do so.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CT pulmonary angiogram (CTPA)

Frequently asked questions

Is a CT pulmonary angiogram the same as a routine CT scan?
No. A routine CT scan and a CT pulmonary angiogram use similar equipment, but the angiogram is timed to highlight contrast-filled blood vessels in the lungs.
Does the scan involve radiation and contrast dye?
Yes. CT imaging uses ionizing radiation, and iodinated intravenous contrast is used to make the pulmonary arteries visible.
What if I am allergic to contrast dye?
Tell the imaging center before the examination. The care team can review your allergy history, assess the risk, and determine whether special precautions or an alternative test are 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