Coronary Calcium Score: The Heart Risk Number
A five-minute CT scan that counts calcium in your heart arteries produces one of the most powerful risk predictors in preventive cardiology — and most people who should get one never have.
A coronary artery calcium (CAC) score is a quick, low-radiation CT scan counting calcium deposits in heart arteries — a direct measure of atherosclerosis that sharpens heart-attack and stroke risk prediction beyond cholesterol alone. Scores run from 0 (very low risk) to 1,000+ (high risk). It is most useful for borderline-risk adults deciding whether to start statins.
What is a coronary calcium score?
As cholesterol plaques age, they calcify — and calcium shows up vividly on CT. The scan counts and density-weights those deposits into a single score. Zero means no detectable calcium — a powerful "not now" for preventive medication in borderline patients. Higher scores map onto proportionally higher event risk over the following decade, refining the guesswork that cholesterol-only models leave behind.
Who should get a calcium score?
Adults 40–75 whose risk sits on the statin borderline — where guidelines say the decision is genuinely uncertain. Traditional risk factors (cholesterol, blood pressure, smoking, diabetes, age) produce a percentage; when that percentage hovers near the treatment threshold, the calcium score tips the decision: zero often defers medication, high scores often start it. It is not for everyone — symptomatic patients need functional testing, and very-low-risk young patients need neither.
What do the score ranges mean?
| Score | Interpretation |
|---|---|
| 0 | No detectable calcium — very low near-term risk; medication often deferred |
| 1–99 | Mild plaque — risk-factor control emphasized; statins individualized |
| 100–399 | Moderate plaque — statins usually recommended; risk-factor treatment intensifies |
| 400+ | Extensive plaque — high risk; aggressive prevention, sometimes further testing |
How much radiation is in a calcium score scan?
Very little — the scan is low-dose by design, typically a fraction of a diagnostic chest CT, delivered in a single breath-hold with no contrast dye. The risk-benefit is favorable for the borderline-risk population it serves: one small exposure to answer a question that otherwise means years of either unnecessary medication or unprotected arteries.
Borderline on heart risk?
Ask our team whether this scan belongs in your decision.
Contact SATMED HealthFrequently asked questions about coronary calcium scoring
Is a coronary calcium score the same as a heart CT angiogram?
No — the calcium score counts plaque calcium without dye; CT angiography images the artery walls and narrowing with contrast. Different questions, different tests.
Does insurance cover calcium scoring?
Coverage varies — many plans cover it for defined intermediate-risk patients; cash prices are often modest ($75–$300).
What does a calcium score of zero mean?
No detectable calcium — a strong near-term reassurance; many patients defer statins on that evidence.
Can plaque be present with a zero score?
Non-calcified plaque can hide, but a zero still predicts very low near-term risk — the test measures what it can see, and what it sees matters.
How often should calcium scoring repeat?
Usually every 5–10 years for zeros, or when risk factors change — not annually.
Does a high score mean I will have a heart attack?
No — it raises risk estimates, and treatment meaningfully lowers them. The score directs prevention; it does not pronounce destiny.
How SATMED Health makes contrast imaging safer
If your exam includes contrast, the delivery equipment matters as much as the scanner. SATMED Health engineers the systems behind every injection.
Contrast injector systems built for controlled, consistent delivery — the right dose at the right moment, every time.
Learn more →Engineered syringes for smooth, low-pressure injections that reduce discomfort and protect the vessel at the IV site.
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Sources
- RadiologyInfo.org (ACR · RSNA · ASRT). Radiation Dose from X-Ray and CT Exams.
- RadiologyInfo.org (ACR · RSNA · ASRT). Body CT. Reviewed June 15, 2026.
- American College of Radiology. ACR Accredited Facilities Database.
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Contact SATMED HealthMedical disclaimer: This article is for education only and is not medical advice, diagnosis, or treatment. Always follow the instructions of your imaging facility and your own physician. If you think you are having an emergency, call 911 (or your local emergency number) immediately.
Please note: SATMED Health is not a medical facility. Please contact your physician with specific medical questions or for a referral to a radiologist. To locate an accredited medical imaging provider in your community, search the ACR accredited facilities database. This website does not provide cost information; imaging costs vary by region.
