Overview
Why Risk Calculation Matters
A 52 year old patient may have an LDL C that looks only moderately elevated yet still have a treatment level cardiovascular risk because age, blood pressure, smoking, diabetes,...
A 52-year-old patient may have an LDL-C that looks only moderately elevated yet still have a treatment-level cardiovascular risk because age, blood pressure, smoking, diabetes, and HDL-C combine to change the absolute probability of an event. The reverse is also true: a single reassuring lipid value does not erase risk from multiple other factors. Risk calculation answers a narrow question: what is this person's estimated probability of a future cardiovascular event over a defined period? It is a primary-prevention tool. First determine whether the patient already has clinical ASCVD or another condition for which lipid-lowering therapy is indicated; in those situations, treatment should not wait for a calculated score. For Canadian practice, use the Canadian Cardiovascular Society approach: the Framingham Risk Score or the Cardiovascular Life Expectancy Model in eligible adults aged 40 to 75. Do not import a US calculator simply because it is labelled ASCVD. The AHA PREVENT equations became the current US standard in 2026, but Canada has not adopted PREVENT.