CT Coronary Calcium Score

Calcium Score, also known as CT Coronary Calcium Score, is a diagnostic imaging procedure that uses computed tomography (CT) to detect calcifications in the coronary arteries. It is performed to assess the extent of arterial deterioration and to evaluate an individual’s future risk of developing coronary artery disease, even in the absence of symptoms.

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Calcium Score, or CT Coronary Calcium Score, is a diagnostic imaging procedure used to detect calcifications in the coronary arteries using computed tomography (CT). Its purpose is to assess the extent of arterial deterioration and evaluate the future risk of developing coronary artery disease, even in individuals who have no symptoms.

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Advantages of Calcium Score

High Accuracy in Risk Assessment
Provides a highly accurate evaluation of the risk of coronary artery disease, enabling timely prevention strategies or early intervention planning.
Simple and Painless Examination
The procedure is quick, non-invasive, painless, and requires only a short examination time.
No Contrast Injection, Low Radiation Exposure
No contrast agent is required, resulting in low radiation exposure and enhanced patient safety.
Cost-Effective
Calcium Score is a relatively cost-effective screening option for early detection of coronary artery disease.

How Is Calcium Score Different from an Exercise Stress Test (EST)?

Coronary artery narrowing develops gradually, progressing from mild to severe over time. In the later stages, atherosclerosis leads to hardened coronary arteries, which may cause blockages, obstructions, or plaque rupture. Calcium Score enables early detection of arterial changes or deterioration, even at the initial stages of disease development.

In contrast, an Exercise Stress Test (EST) evaluates blood flow to the heart during physical exertion or increased cardiac workload. When coronary arteries become significantly narrowed, blood flow is restricted, leading to chest discomfort and detectable changes in the heart’s electrical activity during exercise. As a result:

“Abnormalities in an Exercise Stress Test are typically detected only when the coronary arteries are already significantly narrowed.”

However, Calcium Score (CAC) can identify calcifications adhering to the arterial walls, even in the early stages of disease when patients have no symptoms.

Calcium Score and Future Heart Disease Risk

Calcium Score not only detects the presence of calcifications but also reflects the degree of arterial deterioration. The amount of calcium detected correlates with the plaque burden within the coronary arteries—higher calcium levels indicate greater arterial damage and a higher risk profile.

Most importantly:

“The amount of coronary calcification provides clear insight into an individual’s risk of developing heart disease over the next 5–10 years.”

For this reason, Calcium Score is a valuable diagnostic tool for identifying early coronary artery disease, assessing future cardiovascular risk, and guiding appropriate preventive care or treatment to reduce the likelihood of severe coronary artery disease.

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This evidence has been recognized within the global medical community for more than 20 years, supported by extensive research conducted in the United States, Europe, and Thailand. Many medical professionals—including a large number of Thai physicians—have acknowledged the significance of these findings and shown strong interest in their clinical application. Landmark studies such as the Multi-Ethnic Study of Atherosclerosis (MESA), a long-term research initiative in the United States spanning over two decades and resulting in more than 2,000 published scientific papers, have provided critical insights into this field.