Calcium levels in the arteries of heart (coronary arteries) indicate your risk of getting heart diseases. Coronary artery calcium (CAC) score helps to predict one’s risk for heart attack irrespective of age, race and bad habits. Calcium score indicates the level of calcium on the walls of the coronary arteries. This research study was done by University of California scientists and published in the New England Journal of Medicine. They did the research study on 6,700 persons from all major ethnic groups. 
Calcium levels in the coronary arteries can be detected by CT scan and calciums core acts as marker for coronary artery diseases. Prognosis worsens as calcium levels rise in the arteries.
If Coronary calcium score is between 101 and 300, risk of getting heart attack is 8 times higher while risk is 10 times more if calcium score is above 300.
CT scan screening is a non-invasive technique that helps to prevent heart attacks although it is an expensive one. Cardiac CT scan costs about $250 to $500 but helps to find out even minor obstruction (fat or calcium) in the arteries that was missed by other diagnostic tests.
Cardiac CT scan may gradually replace tests like Treadmill. One should not do this CT scan without physician’s advice. Before this test, one should take routine tests like Blood cholesterol, C-reactive protein, ECG and ECHO under doctor’s supervision.
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