Coronary Artery Calcium Score Explained: Early Detection of Heart Disease

This article is part of our Preventive Cardiology Guide, which explains how early detection and risk assessment help reduce cardiovascular disease risk.

Cardiovascular disease often develops gradually over decades before symptoms appear. Many individuals with significant coronary plaque have no warning signs until a heart attack or other cardiovascular event occurs.

A coronary artery calcium (CAC) scan is a non-invasive imaging test that measures calcified plaque within the coronary arteries. Because calcified plaque represents the presence of atherosclerosis, CAC scoring can help identify cardiovascular risk earlier than many traditional risk assessments.

What Is a Coronary Artery Calcium Score?

A coronary artery calcium score is obtained using a specialized CT scan that detects calcium deposits within the coronary arteries.

Calcium in the coronary arteries is considered a marker of atherosclerotic plaque, which can narrow arteries and increase the risk of heart attack.

The result of the scan is expressed as a numerical score, commonly called the Agatston score, which reflects the amount of calcified plaque present.

How CAC Scores Are Interpreted

Coronary artery calcium scores generally fall into several broad categories:

• 0 – no detectable coronary calcium
• 1–99 – mild plaque burden
• 100–399 – moderate plaque burden
• 400+ – extensive plaque burden

Higher CAC scores indicate a greater burden of coronary artery plaque and may be associated with increased cardiovascular risk.

Why CAC Scanning Is Used in Preventive Cardiology

Traditional cardiovascular risk assessments often rely on factors such as cholesterol levels, blood pressure, age, and family history.

While these factors are important, they do not directly measure whether plaque has already formed in the arteries.

CAC scanning provides a direct look at coronary plaque, helping clinicians better understand cardiovascular risk before symptoms appear.

Learn more about cardiovascular prevention in our guide to Preventive Cardiology.

How CAC Scans Detect Early Atherosclerosis

Atherosclerosis begins with the accumulation of lipids and inflammatory cells within arterial walls.

Over time, these plaques can become calcified, allowing them to be detected using CT imaging.

Because plaque can develop silently over many years, CAC scanning may help identify early atherosclerosis before clinical symptoms develop.

CAC Scores and Other Cardiovascular Markers

Coronary artery calcium scores are often interpreted alongside other cardiovascular markers such as cholesterol levels, ApoB, inflammation markers, and metabolic health indicators.

Understanding these markers together may provide a more complete picture of cardiovascular risk.

Learn more in our article on ApoB Explained.

Preventive Cardiology and Longevity

Preventive cardiology focuses on identifying cardiovascular risk early and addressing modifiable risk factors before disease progresses.

Because cardiovascular disease is one of the leading causes of mortality worldwide, early detection strategies play an important role in supporting long-term health.

Learn more about our clinical philosophy in The HormoneSynergy® Longevity Medicine Model.

Frequently Asked Questions

What does a CAC score of zero mean?

A CAC score of zero indicates that no calcified plaque was detected in the coronary arteries at the time of the scan.

Is a CAC scan safe?

CAC scans use a low-dose CT scan and are generally considered safe when used appropriately.

Who should consider a CAC scan?

CAC scans are often considered for individuals seeking additional insight into cardiovascular risk, particularly when traditional risk estimates are uncertain.

Does CAC detect all plaque?

CAC scans detect calcified plaque. Some early plaques may not yet be calcified and therefore may not be detected.