What is the difference between a Coronary Artery Calcium (CAC) scoring test and a Coronary Computed Tomography (CT) scan?

Our Medical A.I. is used by practicing medical doctors at top research institutions around the world. Ask any follow up question and get world-class guideline-backed answers instantly.

A calcium scoring test and a coronary calcium CT scan are essentially the same procedure, utilizing computed tomography (CT) technology to detect and measure calcium deposits in the coronary arteries, with the primary difference being in terminology rather than methodology. This non-invasive test is crucial for assessing the risk of coronary artery disease and potential future cardiac events. The procedure involves lying on a table that slides into a donut-shaped CT scanner, which takes multiple X-ray images of the heart, all without the use of contrast dye, and typically completes within 10-15 minutes
1
.

The calcium score, which ranges from zero (indicating no detectable calcium) to over 400 (indicating extensive calcification), is a key indicator of heart disease risk, with higher scores signifying greater risk
2
. This test is particularly beneficial for individuals with intermediate risk factors for heart disease, such as a family history of coronary artery disease, high cholesterol, or high blood pressure, who have not yet exhibited symptoms
3
.

Key points about the calcium scoring test and coronary calcium CT scan include:

Given the most recent and highest quality evidence, the use of calcium scoring or coronary calcium CT scans for risk assessment in asymptomatic individuals, especially those at intermediate risk, is supported by guidelines such as those from the European Society of Cardiology in 2024
3
, emphasizing the importance of these tests in guiding treatment decisions and enhancing risk stratification.

acr appropriateness criteria® asymptomatic patient at risk for coronary artery disease: 2021 update.