Lipoproteins
ApoA1 and ApoB give a detailed view of cholesterol balance — ApoA1 reflects protective HDL particles, while ApoB represents atherogenic LDL particles that promote plaque build-up. The ApoB/ApoA1 ratio is a strong predictor of cardiovascular risk, offering more precision than standard cholesterol tests. Lipoprotein(a), or Lp(a), is a genetic marker that can elevate heart disease risk even when other lipid levels are normal. Measuring both provides early insight into hidden or inherited cardiovascular risks, guiding targeted prevention.
Cholesterol
Lipids and cholesterol are fat-like substances in your blood. Some are necessary for good health, but when you have a high level of cholesterol in your blood, a lot of it ends up being deposited in the walls of your arteries and other vital organs. Lifestyle choices including diet, exercise and alcohol intake can all influence cholesterol levels and your risk of developing heart disease.
IDL
These intermediate LDL fractions represent particles in the middle of the size and density spectrum. A balanced distribution across these mid subfractions is considered normal, while higher proportions may reflect shifts toward smaller, denser LDL particles, which are more strongly linked to atherosclerosis.
Large LDL
Large LDL particles (LDL-1 and LDL-2) are larger and more buoyant, meaning they are less likely to penetrate arterial walls and form plaque. Higher levels of these subfractions are generally viewed as less atherogenic and may reflect a more favourable lipid profile. Larger, less dense particles transport cholesterol efficiently without easily contributing to arterial blockage.
Small Dense LDL
Smaller, denser LDL particles (LDL-3 to LDL-7) are more reactive and inflammatory, making them more prone to entering the arterial wall and promoting plaque formation. Elevated small dense LDL is associated with a higher risk of heart disease, even when total LDL cholesterol appears normal. These particles indicate increased cardiovascular risk, especially when combined with insulin resistance, high triglycerides, or low HDL cholesterol.
Lipid Subfractions Summary
Your mean LDL particle size provides key insight into coronary risk. Larger, more buoyant LDL particles are generally linked with a lower likelihood of arterial plaque buildup, while smaller, denser LDL particles are more atherogenic and associated with higher cardiovascular risk. Evaluating mean particle size alongside overall lipid subfraction balance offers a more precise view of coronary health and long-term heart disease risk than standard cholesterol testing alone.
