An Update on Coronary Artery Calcium Interpretation at Chest and Cardiac CT

How a coronary calcium scan gets reported turns out to matter as much as the number itself. This Johns Hopkins review is a practical manual for doing it right.

Its recommendations are concrete: report both the absolute Agatston score and the age/sex/race percentile; flag a score above 1000 as a distinct very-high-risk category equivalent to established heart disease; note which vessels are involved (the left main especially); and use the standardized CAC-DRS system so scores read consistently across both dedicated cardiac CT and incidental chest CT. A useful anchor: each doubling of the calcium score raises ASCVD risk by about 14%.

The practical takeaway is that any chest CT is an opportunity to capture calcium data, and a well-structured report turns a number into a decision — defer a statin at zero, intensify prevention when the percentile is high.

We rate the evidence high for a review: an authoritative synthesis from a leading CAC group, built on MESA and the CAC Consortium and aligned with guidelines, though narrative and with the senior author disclosing industry fees. Its clinical significance is high — it standardizes how the single best non-invasive risk marker gets communicated and acted on.