A non-contrast coronary calcium CT scan is used to help detect calcium deposits in atherosclerotic plaque in the coronary arteries. The greater the buildup of calcium, the higher one’s risk for future cardiovascular events. Doctors recommend this test for patients with the following traits: family or personal history of coronary artery disease; males over age 45 and females over the age of 55; history of smoking, high cholesterol, diabetes, or high blood pressure; excess weight; and inactivity. Cleveland Clinic, February 2021