LDL Cholesterol and Atherosclerosis

LDL particles transport cholesterol from the liver to peripheral tissues. When present in excess, LDL particles penetrate the arterial endothelium and deposit cholesterol in the vessel wall. Over time, this cholesterol accumulation, combined with inflammatory processes, creates atherosclerotic plaques that narrow arteries and can rupture to cause heart attacks. LDL-C measures total cholesterol mass, but the actual risk driver is particle number (measured by ApoB). This discordance explains why some patients with "normal" LDL-C still have events.

1

Not the Whole Story

LDL-C and ApoB are discordant in about 20% of people. When they disagree, ApoB better predicts risk.

2

Highly Treatable

Statins reduce LDL-C by 30-50%. PCSK9 inhibitors can reduce it by an additional 50-60% on top of statins.

Optimal LDL Cholesterol Benchmarks

Functional Range (Cardiovascular Focused) Optimal: < 100 mg/dL; High-risk patients: < 70 mg/dL
Standard Lab Range Standard: < 130 mg/dL (desirable); 130-159 borderline high; >= 160 high

Common Questions

Is LDL cholesterol still important if I test ApoB?

Yes. LDL-C remains useful for treatment monitoring and is the primary target for statin therapy guidelines. But ApoB provides the more accurate risk assessment.

What is the difference between LDL-C and LDL-P?

LDL-C measures cholesterol mass inside LDL particles. LDL-P (or ApoB) counts the number of particles. Two people can have the same LDL-C but very different particle counts.