Warranty Period of a Calcium Score of Zero: Comprehensive Analysis From MESA

A calcium score of zero is reassuring — but for how long? This MESA analysis answers the practical follow-up question every clinician faces: when should a person with a clean scan be rescanned?

Tracking participants who started with zero calcium, the investigators modeled the “warranty period” — the time until enough people convert to a positive score to warrant rechecking. It ranged from about 3 to 7 years depending on demographics, and the modifiers were illuminating: diabetes shortened the warranty by 35 to 38 percent (3–4 years rather than 5–7), while family history and smoking had smaller effects. Importantly, a newly positive scan preceded most future events, tripling event risk.

This converts the abstract “zero is good” into actionable scheduling. It tells clinicians that the reassurance of a zero score expires — sooner in people with diabetes — and gives evidence-based intervals for repeat scanning.

We rate the evidence strong. It is a rigorous analysis from the premier calcium-scoring cohort, directly useful for the efficient, individualized testing strategy this library values.