A coronary calcium score measures hardened plaque in heart arteries. Learn what the numbers mean, who should take it and how it differs from CTCA.
A coronary calcium score is a quick, non-contrast CT scan that measures calcium in the heart arteries. A score of 0 means no calcium and a very low short-term heart risk; higher scores mean more plaque and a higher risk of heart disease.
What Is a Coronary Calcium Score?
As plaque builds up in heart arteries, parts of it harden with calcium. A special low-dose CT scan, gated to the ECG, measures this calcium. The result is a number called the Agatston score. It does not show soft plaque or how narrow the artery is, but it is a strong marker of overall plaque burden. See CT coronary angiography for the detailed scan.
Calcium score (Agatston)MeaningUsual action0No calcium seenLow risk; maintain healthy lifestyle1 to 99Mild plaqueLifestyle and risk review100 to 399Moderate plaqueDoctor may advise medicines400 or moreExtensive plaqueCloser cardiology reviewWho Should Consider the Test?
- Adults, usually 40 to 75 years, at intermediate risk of heart disease
- People with a family history of early heart attack
- Those with borderline cholesterol, blood pressure or sugar who are unsure about starting medicines
- People without symptoms who want to know their risk
It is not meant for those with active chest pain. They usually need a different test. See CTCA for chest pain.
How Is the Test Done?
You lie on the CT table with ECG stickers. No injection and no contrast are needed. You hold your breath for a few seconds while the scan runs. The whole test takes about 10 to 15 minutes. There is no special preparation, but avoid caffeine and smoking on the day, as they can raise heart rate and blur images.
Radiation and Safety
The dose is low, similar to a few months of natural background radiation in many cases. There is no contrast, so there is no kidney risk or allergy issue. Pregnant women should avoid it. See CTCA radiation and safety.
Calcium Score vs CT Coronary Angiography
The calcium score is a screening test for risk. CT coronary angiography is a diagnostic test that uses contrast and shows both calcified and soft plaque, and the degree of narrowing. Calcium scoring does not replace angiography if you have symptoms. See CTCA vs conventional angiography.
A Practical Example
Mohan, 50, has no symptoms but has a brother who had a heart attack at 48. His cholesterol is borderline. A calcium score of 220 shows moderate plaque. His doctor starts a cholesterol-lowering medicine, advises diet and exercise, and repeats risk checks. A score of 0 would have supported a more relaxed approach.
Quick Summary
- Fast, no contrast, low dose
- 0 means very low short-term risk
- Higher scores need discussion with a cardiologist
- It does not replace tests for people with symptoms
- Lifestyle changes help at every score
Lifestyle Steps Whatever Your Score Is
- Do at least 150 minutes of brisk walking or similar activity each week.
- Eat more vegetables, fruits, whole grains, pulses and nuts; reduce fried food, sweets and salt.
- Stop smoking and limit alcohol.
- Check blood pressure, sugar and cholesterol regularly.
- Take medicines exactly as prescribed.
A calcium score is a guide and not a verdict. Discuss your result with a cardiologist. See heart attack warning signs so you know when to seek urgent help.
Common Questions After Getting Your Score
Many people ask whether a high score means a heart attack is certain. It does not. It means your risk is higher and that prevention matters more. People with a score of 0 can relax a little but should not stop healthy habits. If you have chest pain, breathlessness or pain spreading to the arm or jaw, do not wait for a repeat score. Seek urgent medical help. For symptoms, your doctor may advise CT coronary angiography or a stress test. Read CTCA vs TMT stress test.
Frequently Asked Questions
What is a good calcium score?
A score of 0 is the best. Higher scores mean more calcium in the arteries.
Is the test painful?
No. There is no needle or contrast.
Do I need to fast?
Usually not, but avoid caffeine and smoking before the test.
Can a score of 0 still mean a risk?
It lowers risk but does not remove it, especially in smokers and young people with soft plaque.
How often can the test be repeated?
Usually not sooner than 3 to 5 years, unless the doctor advises.
Can calcium score reduce with treatment?
The score usually does not fall, but treatment can slow the risk.
Is it covered by insurance?
It varies. Check with your insurer.
Is it safe?
Yes. The dose is low.
Can I eat after the test?
Yes, immediately.
Book Your Test at Ganesh Diagnostic
Ganesh Diagnostic & Imaging Centre in Rohini, Delhi offers this test with trained radiology staff and clear reports. You can book an appointment online, check our branches across Delhi NCR, contact us for current rates, or explore all our services. Reports can be downloaded online through our patient portal, so you do not need to make a second trip just to collect them.
This article is for general information only. It does not replace advice from your doctor. Always follow your doctor's instructions for your test.
