Small LDL Particles

The number of small, dense LDL particles, a subtype linked to insulin resistance.

Ranges vary by laboratory, method, age and sex: always use the range printed on your own report. Why labs differ.

What it measures

LDL particles vary in size. Small dense LDL forms when triglyceride-rich VLDL is remodeled in the presence of high triglycerides and hepatic lipase activity. Advanced lipid panels report the count of these smaller particles.

Why it matters

Small LDL particles stay in circulation longer, penetrate the artery wall more easily and are more prone to oxidation. A high count is part of the 'atherogenic dyslipidemia' pattern of insulin resistance, though much of its risk is captured by total LDL-P or ApoB.

What a high result can mean

High values are typically seen with elevated triglycerides, low HDL, insulin resistance, prediabetes, type 2 diabetes, abdominal obesity and high refined-carbohydrate intake, and have a genetic component.

What a low result can mean

Low numbers are favorable and are not a concern.

What affects the result

Reference cut-offs differ between NMR (Labcorp) and ion mobility (Quest) assays, so compare results within the same method. Lowering triglycerides through reduced sugar and alcohol, weight loss and exercise shifts particles toward larger sizes.

Unit

Usually reported in nmol/L.

Also called on lab reports

Small LDL-P, Small LDL Particle Number, LDL Small, Small LDL, Small Dense LDL Particles

Related tests: Lipids & Cardiovascular Risk

• Total Cholesterol
• LDL Cholesterol
• HDL Cholesterol
• Triglycerides
• Non-HDL Cholesterol
• VLDL Cholesterol
• Cholesterol/HDL Ratio
• LDL Particle Number
• LDL Particle Size
• HDL Particle Number
• Apolipoprotein B
• Apolipoprotein A1

This page is educational and does not replace advice from a healthcare professional.