LDL Particle Number and Risk of Future Cardiovascular Disease in the Framingham Offspring Study

This Framingham analysis is one of the clearest demonstrations of why counting LDL particles can outperform measuring LDL cholesterol — especially in the patients most likely to be falsely reassured.

Using NMR spectroscopy to measure LDL particle number directly, the investigators found it more strongly associated with future cardiovascular events than LDL cholesterol or even non-HDL cholesterol. The decisive evidence came from discordance: when particle number and cholesterol disagreed, risk tracked with the particle number. People with low LDL cholesterol but high particle number remained at elevated risk, while those with genuinely low particle number had fewer events.

This is the empirical heart of the particle-versus-cholesterol debate. A patient can have a comfortable-looking LDL cholesterol while carrying a dangerous number of LDL particles — and it is the particles that lodge in the artery wall.

We rate the evidence strong. It is a well-conducted cohort from a premier study, and its discordance analysis provides some of the most persuasive evidence that particle-based measures (LDL-P, and by extension apoB) capture risk that cholesterol content alone can hide.