"The LDL cholesterol test measures the amount of cholesterol inside the low-density lipoprotein particles circulating in the bloodstream. Those LDL particles containing the cholesterol can get trapped in artery walls, forming plaques that can eventually block blood flow. As the test measures the amount of cholesterol being carried, not the number of LDL particles themselves, two people can have the same LDL cholesterol level but very different numbers of particles, and therefore different levels of risk."
"Apolipoprotein B, or apoB, reflects the total number of cholesterol-carrying particles in the blood rather than how much cholesterol they contain. A growing body of research suggests it's a more accurate way of identifying who is at risk and who's not. In March 2026, the American Heart Association and American College of Cardiology recognized this. Their updated cholesterol guidelines acknowledged apoB as a potentially more precise marker, in line with earlier European recommendations."
"But they stopped short of recommending apoB as the primary method for testing. "They review the evidence and rank apoB as superior, but the actual rules of the road continue to prioritize LDL," says Allan Sniderman, a cardiologist at McGill University. Sniderman was an author on a 2026 JAMA modeling study that analyzed lifetime outcomes for around 250,000 US adults eligible for statin treat"
LDL cholesterol testing has long guided cardiovascular risk assessment by measuring cholesterol carried in low-density lipoprotein particles. Lowering LDL cholesterol reduces heart attacks, strokes, and early death, and this evidence shaped guidelines and statin use. The LDL test measures cholesterol content rather than the number of LDL particles. Two people can share the same LDL cholesterol level but have different particle counts, leading to different plaque formation risk. ApoB reflects the total number of cholesterol-carrying particles in the blood. Research indicates apoB may identify higher-risk and lower-risk individuals more accurately. Updated American guidelines recognize apoB as potentially more precise but do not make it the primary testing method.
Read at WIRED
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