If you are at low risk of a heart attack, or if you have already had a heart attack or coronary heart disease treatment, a heart scan may not be effective. For example, if you are under 40, don't smoke and have normal cholesterol and blood pressure, a heart scan is not necessary. If you've had a heart attack in the past, a heart scan will not provide any new information about your treatment plan that your physician won't already know.
The above criteria are recommended but not required for scheduling a heart scan.