Heart disease often develops slowly over time, even before symptoms appear. A Coronary Artery Calcium (CAC) CT scan is a special type of heart scan that looks for calcium deposits in the arteries that supply blood to the heart. Calcium in these arteries is a sign of plaque buildup, which can increase the risk of heart attack or stroke. The CAC scan gives a “calcium score” that helps health care providers better understand a person’s risk for future heart disease and guide prevention decisions. heart.org
The CAC scan is most helpful for people who are at moderate or uncertain risk for heart disease, especially when it is unclear whether medications such as cholesterol‑lowering drugs are needed. A higher calcium score means more plaque and a higher risk of heart attack, while a score of zero suggests a lower short‑term risk. The scan itself is quick, painless, and does not require needles or contrast dye. It can help patients and providers decide on next steps, such as lifestyle changes or starting medication. mayoclinic.org
Like all medical tests, there are some risks to consider. The scan uses a small amount of radiation, like that of a mammogram. It is not recommended for everyone, especially those who already have heart disease or are at very low risk. The CAC scan should be used as a tool to support discussion, not as a stand‑alone test. If you have questions about your heart disease risk or whether a coronary calcium scan is right for you, talk with your health‑care provider.