What a CT Calcium Score Can Reveal About Your Heart Risk

Coronary artery disease (CAD) develops silently, often over years before symptoms or complications appear. A CT calcium score test is one of the most straightforward tools available for catching CAD early, before it becomes a crisis. It uses X-ray imaging to detect calcium deposits in the coronary arteries, which are key markers of plaque buildup associated with coronary artery disease. If you are at an elevated risk for developing CAD, a CT calcium score test can help provide a clearer picture of your cardiovascular health and support more informed decisions about prevention and long-term care.

What Does a CT Calcium Score Test Measure?

A CT calcium score test, also known as a coronary artery calcium (CAC) test or heart CT scan, is a noninvasive imaging exam that measures the amount of calcium deposits present in the coronary arteries. Calcium deposits indicate the presence of plaque, a buildup of cholesterol, fat, and other substances that accumulates along artery walls. Calcium causes plaque to harden, which can narrow the arteries and block blood flow to vital organs. When this occurs in the arteries leading to the heart — the coronary arteries — it can result in a heart attack. 

Based on the scan, you are assigned a calcium score that reflects the extent of calcium deposits found in your coronary arteries. Scores range from zero to over 1,000. In general: 

• A score of 0 suggests no calcium detected, indicating a very low risk of a heart attack in the next two to five years.

• Scores between 1 and 100 indicate mild plaque buildup.

• Scores between 101 and 400 suggest moderate evidence of coronary artery disease.

• Scores above 400 indicate extensive plaque buildup, suggesting a higher risk of a heart attack.

Your cardiologist will interpret your score alongside your other risk factors to determine the most appropriate next steps.

Who May Benefit From a CT Calcium Score Test 

Your cardiologist may recommend this test if you are over the age of 40 and have one or more cardiovascular risk factors. It is generally not recommended for patients who are already known to have coronary artery disease or who are at very low risk.

Risk factors that may make you a candidate for screening include:

• High blood pressure

• High cholesterol

• Diabetes

• A family history of heart disease

• Smoking

• Obesity

Knowing your calcium score can help your provider determine whether preventative care is necessary, and if so, which strategies would be most effective for lowering your risk of heart attack. Depending on your score, your provider may recommend cholesterol or blood pressure-lowering medications, lifestyle modifications, more frequent monitoring, or further evaluation. 

How CT Calcium Score Differs From Other Heart Imaging Tests

A CT calcium score test is primarily used in preventive cardiology, helping providers assess cardiovascular health in patients who have risk factors but no present symptoms.  

A CT calcium score test is sometimes confused with a CT angiogram, which is used for patients experiencing active symptoms of a blockage, such as chest pain. Unlike a CT calcium score, a CT angiogram uses an intravenous contrast dye to track blood flow through the coronary arteries, providing visualizations of areas of narrowing or blockages. 

Preventive Cardiology at Florida Cardiovascular Specialist

At Florida Cardiovascular Partners, our team is committed to helping patients understand and actively manage their cardiovascular health before issues progress. If you have risk factors for coronary artery disease or have questions about whether a CT calcium score test is right for you, we encourage you to contact us or schedule an appointment to learn more.