LDL has been called "the bad cholesterol" for decades. But the number that best predicts your cardiovascular risk is called ApoB — and the two can easily point in different directions. Here is the difference, explained simply.
Reading time 5 min · Updated June 2026 · Aevia Insights
- LDL measures the amount of cholesterol in your blood — ApoB counts the particles carrying it.
- It is the number of particles that enter the artery wall and drive atherosclerosis.
- LDL and ApoB usually track together, but not always — and then ApoB is the one to trust.
- Both are included in Aevia's full blood panel.
What does LDL actually measure?
LDL cholesterol tells you how much cholesterol is transported in your LDL particles — the cargo, not the trucks. Two people with the same LDL can have very different particle counts, because some particles are large and cholesterol-rich while others are small and poor.
What is ApoB?
Apolipoprotein B is the protein on the surface of every harmful lipoprotein particle (LDL, VLDL, IDL and Lp(a)) — exactly one molecule per particle. Measuring ApoB therefore counts the trucks directly. And it is the number of trucks that decides how many drive into the artery wall.
When do they disagree?
Especially with insulin resistance, raised triglycerides and metabolic syndrome you see "discordance": normal LDL but high ApoB, because the particles are small and numerous. Here LDL underestimates the risk — and these are precisely the people often told their "numbers look fine".
What is a good number?
As a rule of thumb, ApoB below 0.9 g/L is good for most people; at higher risk the target is often below 0.8. ApoB responds well to diet (less saturated fat, more fibre), weight loss and exercise — and the response can be measured within months.
Frequently asked questions
Should I stop measuring LDL?
No. LDL is still useful and part of every standard panel. The point is that ApoB should have the final say when the two disagree.
Is ApoB included in Aevia's packages?
Yes, ApoB is part of the full blood panel in every package, and it is one of the markers the physician weighs most heavily in your report.
This article is general information and does not replace individual medical advice.