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CT Coronary Artery Angiography with Intravenous Contrast

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

A CT scan that uses intravenous contrast and imaging to evaluate the coronary arteries for narrowing, plaque, or calcium buildup.

Quick summary

["This test helps assess the coronary arteries and may identify or rule out coronary artery disease."]

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

Key facts at a glance

LOINC
87842-1
Short code
CTA Coronary aa+PA+TA W contr IV
Synonyms
CTA Coronary aa+PA+TA 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?

Coronary CT angiography is an imaging test that uses a special scanner and intravenous contrast to create detailed pictures of the heart's coronary arteries.

Why might I need this test?

It may be used to evaluate chest pain, shortness of breath, or other possible signs of coronary artery disease. It can also show plaque, narrowing, and calcium buildup in the coronary arteries.

How is the test performed?

You lie on a CT scanner table while images are taken. Contrast material is injected into a vein, and a brief scan is performed over the heart. A radiologist then reviews the images.

How do I prepare for the test?

Follow the instructions from your imaging center, which may include temporarily avoiding caffeine or fasting. Tell the care team if you have kidney disease, have had a serious reaction to contrast, are pregnant or may be pregnant, or have other relevant medical conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings may indicate coronary artery narrowing, plaque, or calcification associated with coronary artery disease. The results are interpreted together with symptoms, medical history, and other heart tests. The scan may also identify conditions that do not directly involve the coronary arteries.

Short name

Coronary CT angiography

Frequently asked questions

Is this the same as cardiac catheterization?
No. Coronary CT angiography uses a scanner and injected contrast without a catheter placed into the heart, although both tests can evaluate coronary artery disease.
Is the test painful?
The scan itself is generally painless, but the intravenous contrast injection may cause a brief warm or flushing sensation.
What should I do if I have a contrast allergy or kidney disease?
Tell the imaging center before the appointment. The care team can determine whether precautions, an alternative contrast formulation, or another imaging method is appropriate.
  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