A coronary or cardiac calcium scoring chart shows scores and interpretations of calcium buildup within the coronary arteries, according to the University of Maryland Medical Center. The risk of having heart disease or a heart attack increases with a higher calcium score.
A calcium score of 10 or less means that there is little to no plaque in the coronary arteries, an indication of low chances of having heart disease or a heart attack, explains the University of Maryland Medical Center. Treatment may be necessary for calcium scores exceeding 100, which indicate heart disease. Scores above 400 indicate a high risk of heart attack.