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CT Angiography of the Chest, Venous System — With Intravenous Contrast

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

A CT scan using IV contrast to examine veins and other blood vessels in the chest, often used to evaluate suspected pulmonary embolism.

Quick summary

["This imaging test can identify blood clots and other abnormalities in the chest's blood vessels."]

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

Key facts at a glance

LOINC
36266-5
Short code
CTA Chest ves W contr IV
Synonyms
CTA Chest ves 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?

Chest CT angiography is an X-ray–based scan that creates detailed images of blood vessels in the chest. Intravenous contrast is injected to make the vessels easier to see.

Why might I need this test?

This test may be ordered to look for a pulmonary embolism, especially when there is sudden shortness of breath, chest pain, coughing blood, or a faster heartbeat. It may also be used to evaluate other blood-vessel problems.

How is the test performed?

A clinician places an IV line and injects an iodine-containing contrast dye. The scanner then takes several rapid X-ray images while you briefly hold your breath. The scan usually takes only a few minutes, although the overall visit takes longer.

How do I prepare for the test?

Follow the imaging center's instructions, as fasting requirements can vary. Tell the care team about any contrast allergy, kidney disease, thyroid disease, or possible pregnancy before the scan.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Chest CT angiogram with IV contrast

Frequently asked questions

Is this the same as a routine chest CT?
No. A CT angiogram is specifically timed to examine blood vessels, and intravenous contrast is typically used to highlight them.
What is the difference between CT angiography and a venogram?
CT angiography uses CT imaging with contrast to examine blood vessels. A venogram traditionally makes veins visible with contrast on X-ray, so CT angiography generally provides detailed cross-sectional images.
Will I need to stay after the scan?
Most patients can leave shortly afterward, but observation may be needed if there was a contrast reaction or if the scan was performed with sedation. The imaging center will provide specific instructions.
  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