A coronary calcium score is one of the most useful numbers in preventive cardiology — and one of the most misunderstood. This article explains what the scan measures, what your score actually tells you, and what it cannot.
What the scan measures
A CT calcium score scan takes a few minutes and involves no injections. It measures the amount of calcified plaque in the walls of your coronary arteries — a footprint left by atherosclerosis over the years. The result is a single number, from zero upwards.
“The score does not diagnose a blockage — it measures risk. Two people with the same score can need very different plans.”
What your number means
A score of zero is reassuring — it makes a heart attack in the next few years very unlikely. Rising scores indicate rising risk, and they sharpen decisions about blood pressure treatment, cholesterol-lowering therapy and lifestyle. What they do not do is show whether any single narrowing is limiting blood flow — that question needs different tests, chosen at consultation.
This article is general information, not personal medical advice. If you have symptoms or a family history of heart disease, book a consultation to discuss your individual risk.
