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Coronary Calcium Risk Calculator (MESA Model)

This calculator estimates 10-year coronary heart disease (CHD) risk incorporating the coronary artery calcium (CAC) score, using the MESA (Multi-Ethnic Study of Atherosclerosis) risk model. CAC directly quantifies coronary atherosclerotic plaque burden and is one of the strongest predictors of future cardiovascular events, particularly valuable for reclassifying patients at intermediate risk on traditional calculators.

SI Units (mmol/L) US Units (mg/dL)
Demographics
Enter age between 45 and 85
Clinical Parameters
Enter value between 1 and 15 mmol/L
Enter value between 0.3 and 5 mmol/L
Enter value between 80 and 250 mmHg
Coronary Calcium Score
Enter a value 0 or above
Please complete all fields above
10-Year CHD Risk (with CAC)
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How CAC Modifies Cardiovascular Risk

The coronary artery calcium score directly quantifies calcified atherosclerotic plaque in the coronary arteries using non-contrast cardiac CT. CAC is one of the strongest independent predictors of future coronary events, with a graded relationship between score and risk. In the MESA study, CAC improved risk prediction beyond traditional risk factors, with a net reclassification improvement of approximately 25% in intermediate-risk individuals.

CAC scoring is particularly valuable for patients in the intermediate ASCVD risk range (7.5–20%) where treatment decisions are uncertain. A CAC of 0 can down-classify risk and support deferral of statin therapy, while elevated CAC (≥100 or ≥75th percentile for age and sex) supports initiation of pharmacotherapy regardless of traditional risk factor levels.

When CAC Scoring Is Helpful

Current guidelines support CAC scoring as a shared decision-making tool in several scenarios: patients with borderline or intermediate 10-year ASCVD risk (5–20%) where the statin decision is uncertain, patients requesting evidence-based risk refinement before committing to long-term medication, and younger patients with a single markedly elevated risk factor (such as strong family history or elevated Lp(a)) where traditional calculators may underestimate lifetime risk.

CAC scoring is not recommended for patients already at high risk (>20%) or those with established cardiovascular disease, as results will not change management. It is also less informative in younger adults (<40) where calcium may be absent despite significant non-calcified disease. For further information on CAC scoring indications, see our detailed guide to coronary artery calcium scoring.

References
  1. McClelland RL, Jorgensen NW, Budoff MJ, et al. 10-Year Coronary Heart Disease Risk Prediction Using Coronary Artery Calcium and Traditional Risk Factors. J Am Coll Cardiol. 2015;66(15):1643–1653.
  2. Budoff MJ, Young R, Burke G, et al. Ten-Year Association of Coronary Artery Calcium With Atherosclerotic Cardiovascular Disease Events: The MESA Study. Eur Heart J. 2018;39(25):2401–2408.
  3. Hecht H, Blaha MJ, Berman DS, et al. Clinical Indications for Coronary Artery Calcium Scoring: An Expert Consensus Statement from SCCT. J Cardiovasc Comput Tomogr. 2017;11(1):54–72.
  4. Arnett DK, Blumenthal RS, Fonarow GC, et al. 2019 ACC/AHA Guideline on the Primary Prevention of Cardiovascular Disease. J Am Coll Cardiol. 2019;74(10):e177–e232.
  5. Jennings GL, Audehm R, Bishop W, et al. Heart Foundation of Australia Position Statement on Coronary Artery Calcium Scoring. Med J Aust. 2020;212(10):435–439.
  6. Blaha MJ, Cainzos-Achirica M, Greenland P, et al. Role of Coronary Artery Calcium Score of Zero and Other Negative Risk Markers for Cardiovascular Disease. Circulation. 2019;140(16):1520–1538.