17/05/2026
Think you know your “bad cholesterol”? Think again. Most people have heard of LDL, but two other hidden players—Lp(a) and ApoB—could be silently raising your heart attack risk, even if your LDL looks normal.
LDL, Lp(a), and ApoB are all markers linked to “bad” cholesterol and cardiovascular risk, but they measure different things.
LDL (Low-Density Lipoprotein): Often called “bad cholesterol.” It carries cholesterol to artery walls, where it can build up as plaque, leading to atherosclerosis. Standard LDL-C measures the amount of cholesterol within LDL particles.
ApoB (Apolipoprotein B): Every artery-clogging particle (LDL, VLDL, IDL, Lp(a)) carries exactly one ApoB protein. Thus, ApoB counts the total number of harmful particles, not just the cholesterol they carry. It may better predict risk than LDL-C, especially when particles are small and dense.
Lp(a) (Lipoprotein(a)): A genetic variant of LDL where an extra protein (apolipoprotein(a)) is attached to ApoB. This makes Lp(a) especially sticky, promoting clotting and rapid plaque formation. Levels are 80–90% genetically determined and not significantly changed by diet or most statins.