Do I need a coronary calcium scan?
A coronary artery calcium scan can clarify risk when the statin decision is uncertain. It is not a universal screening trophy and it does not see soft plaque well.
Clinical answer
Short answer
Consider CAC when your cardiovascular risk is intermediate or the medication decision is genuinely uncertain. I would not use it to avoid treating obviously high risk.
Who should consider it
Adults typically over 40 with borderline/intermediate risk, family history, risk uncertainty, or hesitation about preventive medication where the result would change action.
Who should skip or avoid it
Pregnant people, very low-risk people where it will not change management, and very high-risk people where treatment is already indicated. It also should not reassure someone with active chest pain.
What to measure before / after
CAC score, lipid panel, ApoB, Lp(a), blood pressure, A1c/glucose, smoking status, family history, and symptoms. For chest pain, this is a different diagnostic pathway.
What I’d do first
Use CAC as a tie-breaker, not a personality test. A score of zero can support deferring medication in selected patients; a higher score should make prevention more serious.
What would change my mind
I would use CAC more broadly if trials showed screening-driven treatment improves hard outcomes beyond good risk-factor care. I would use it less if downstream testing harms outweighed decision value in low-risk groups.
The useful question
The question is not whether plaque matters. It does. The question is whether the scan will change what you do next. If the answer is no, the test is mostly theater.
References & citations
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