What It Measures
This test measures the concentration of medium-sized LDL particles in the blood, typically reported in nmol/L. It is part of an advanced lipid panel (NMR LipoProfile or similar) that fractionates LDL into subclasses by size and density, providing a more granular picture of cardiovascular risk than standard LDL cholesterol alone.
Medium LDL particles are a subclass of LDL cholesterol identified by advanced lipoprotein testing (NMR spectroscopy or ion mobility). They represent an intermediate size range (20.5–21.2 nm) between large buoyant LDL and small dense LDL, and their concentration contributes to overall atherogenic particle burden and cardiovascular disease risk.
Current Value
What High Means
Elevated medium LDL particle concentrations indicate increased atherogenic lipoprotein burden. High levels are associated with greater risk of atherosclerosis and coronary artery disease, insulin resistance, metabolic syndrome, and type 2 diabetes. Medium LDL particles can penetrate the arterial wall and contribute to plaque formation. When combined with elevated small dense LDL, the cardiovascular risk is compounded.
Possible Symptoms
Elevated medium LDL particles typically cause no direct symptoms. Over time, they contribute to atherosclerosis which may manifest as chest pain (angina), shortness of breath, peripheral artery disease symptoms (leg pain with walking), or may be silent until a cardiovascular event such as heart attack or stroke occurs.
What Low Means
Low medium LDL particle concentrations are generally favorable and suggest lower atherogenic burden. Very low levels are typically seen in individuals with excellent metabolic health, those on statin therapy, or individuals following low-carbohydrate diets. Extremely low levels across all LDL subfractions may rarely indicate genetic hypolipidemia conditions like hypobetalipoproteinemia.
Possible Symptoms
Low levels generally produce no symptoms and are considered beneficial. Extremely low total LDL (across all subfractions) may rarely be associated with fat-soluble vitamin malabsorption, hormonal imbalances, or neurological symptoms, but this is uncommon with isolated low medium LDL.
Risk Factors
Atherosclerotic cardiovascular disease (ASCVD), coronary artery disease, carotid artery stenosis, metabolic syndrome, insulin resistance, type 2 diabetes, familial hypercholesterolemia, obesity, chronic inflammation, poor diet high in refined carbohydrates and trans fats.
Actionable Advice
Supplements
- •Omega-3 fatty acids (EPA/DHA)
- •Niacin (vitamin B3)
- •Berberine
- •Red yeast rice
- •Plant sterols and stanols
- •Citrus bergamot extract
- •Coenzyme Q10
- •Psyllium fiber
- •Artichoke leaf extract
Diet & Lifestyle
- •Reduce refined carbohydrates and added sugars to improve LDL particle size distribution
- •Increase soluble fiber intake (oats, beans, lentils, flaxseed)
- •Exercise regularly — 150+ minutes of moderate aerobic activity per week shifts LDL toward larger, less atherogenic particles
- •Maintain a healthy weight — even modest weight loss improves lipoprotein profiles
- •Limit trans fats and reduce excessive saturated fat intake
- •Consider a Mediterranean-style diet rich in olive oil, nuts, and fatty fish
- •Manage insulin resistance through carbohydrate moderation and strength training
- •Limit alcohol consumption
- •Prioritize sleep quality (7-9 hours) as poor sleep worsens lipid profiles
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Historical Trend
Related Biomarkers
Resources & Studies
All Readings
| Date | Value | Change |
|---|---|---|
| 2026-01-28 | 391 nmol/L | 0.0 |
| 2025-08-25 | 391 nmol/L | — |