All answers
Answer · biomarkers
LDL-P vs ApoB — what's the difference?
Short answer
Both count atherogenic particles and correlate strongly. ApoB is more standardized and accessible; LDL-P (NMR) provides additional subfraction detail.
Reviewed by Dr. Laura PurdyMay 29, 2026
Full answer
LDL particle number (LDL-P) and ApoB both quantify atherogenic particle burden and correlate strongly, but they measure different things. LDL-P counts LDL particles directly by NMR spectroscopy and provides subfraction detail (sdLDL). ApoB counts the apolipoprotein B-100 molecule, of which each LDL, VLDL, and remnant particle carries exactly one. ApoB is more standardized across labs and is endorsed by major guidelines. Within oMeds review, ApoB is the default; LDL-P is used in advanced workups requiring subfraction context.
Educational. Not a substitute for individualized provider review.
References & sources
- ApoB — Primary source · oMeds
- Reviewed by Dr. Laura Purdy, MD, MBA · Clinical Director, oMeds · Last reviewed 2026-05-29
Related answers
What is ApoB?
ApoB (apolipoprotein B) counts every atherogenic lipoprotein particle in the bloodstream. It is a stronger predictor of cardiovascular events than LDL cholesterol alone because it counts particles, not cargo. Modern cardiometabolic optimization treats ApoB as the primary lipid endpoint.
What is LDL-P?
LDL-P quantifies the absolute number of LDL particles by NMR spectroscopy. When LDL-P and LDL-C diverge, particle number better predicts cardiovascular risk.
Primary source
ApoB