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CT Coronary Artery Calcium Score Without Contrast and CT Coronary Angiography With IV Contrast

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

CT imaging of the heart that measures coronary artery calcium and evaluates coronary arteries for plaque and narrowing.

Quick summary

["The results can help assess the amount of calcified coronary plaque and whether coronary arteries are narrowed."]

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

Key facts at a glance

LOINC
83289-9
Short code
CT Hrt+CA Ca score WO cont+CTA W cont IV
Synonyms
CT Hrt+CA Ca score WO cont+CTA W cont 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?

This is a heart CT examination with two components. A coronary artery calcium score measures calcified plaque in the heart's arteries without contrast, while coronary CT angiography uses IV contrast to create detailed images of those arteries.

Why might I need this test?

These tests may be used to evaluate suspected coronary artery disease, assess heart-related symptoms, or estimate cardiovascular risk. Your clinician will explain which part of the examination is appropriate for your situation.

How is the test performed?

You lie on a CT scanner while images of the heart are taken. The calcium score portion requires no IV contrast; the angiography portion requires contrast injected through a vein.

How do I prepare for the test?

Follow the imaging center's instructions, especially if you will receive IV contrast. Tell the staff about kidney disease, prior contrast reactions, iodine allergy, pregnancy, or any inability to remain still; dietary or medication instructions may vary for coronary CT angiography.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

A higher coronary artery calcium score generally indicates more calcified plaque and may support a higher estimated cardiovascular risk. CT angiography may show plaque, narrowing, or other abnormalities in the coronary arteries. Results should be interpreted with your symptoms, medical history, and other cardiovascular risk factors by your clinician.

Short name

Heart CT Calcium Score and Coronary CT Angiography

Frequently asked questions

Does this test use IV contrast?
The calcium score portion is performed without contrast, but the CT angiography portion uses IV contrast. The imaging center will confirm what to expect before the examination.
Is a coronary artery calcium score the same as a CT angiogram?
No. The calcium score estimates the amount of calcified plaque, while CT angiography produces detailed images of the coronary arteries and can assess narrowing.
What if I have kidney disease or a previous contrast reaction?
Tell the imaging staff before the test. IV contrast may require special precautions or a change in the examination, depending on your kidney function and prior reaction.
  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