What It Measures
This test measures the concentration of large HDL particles in the blood using nuclear magnetic resonance (NMR) spectroscopy. Large HDL particles (typically 8.8–13.0 nm in diameter) are the subfraction of HDL cholesterol most actively involved in reverse cholesterol transport, the process by which excess cholesterol is removed from tissues and arterial plaques and returned to the liver.
HDL Large particles are a subclass of high-density lipoprotein measured by NMR spectroscopy. These large, buoyant HDL particles are the most effective at reverse cholesterol transport — removing cholesterol from arterial walls and delivering it to the liver for excretion. Higher levels of HDL Large particles are strongly associated with reduced cardiovascular risk and are considered a key marker of cardioprotective lipid metabolism.
Current Value
What High Means
Elevated HDL Large particle concentrations are generally favorable and indicate robust reverse cholesterol transport capacity. High levels are associated with reduced atherosclerosis risk, improved cardiovascular outcomes, and efficient lipid metabolism. Very high levels are typically seen in individuals who exercise regularly, consume healthy fats, and have favorable genetics. In rare cases, extremely elevated HDL may be associated with CETP deficiency, though this is uncommon and not necessarily harmful.
Possible Symptoms
High HDL Large particles are generally asymptomatic and considered protective. No adverse symptoms are typically associated with elevated levels.
What Low Means
Low HDL Large particle concentrations indicate impaired reverse cholesterol transport and increased cardiovascular risk. Low levels are associated with metabolic syndrome, insulin resistance, type 2 diabetes, obesity, sedentary lifestyle, smoking, and high-carbohydrate/high-sugar diets. A shift from large to small HDL particles suggests dysfunctional HDL that is less cardioprotective, even if total HDL cholesterol appears normal.
Possible Symptoms
Low HDL Large particles are often asymptomatic until cardiovascular disease manifests. Associated conditions may present as chest pain (angina), shortness of breath, fatigue, and signs of metabolic syndrome including central obesity, elevated blood pressure, and impaired fasting glucose.
Risk Factors
Coronary heart disease, atherosclerosis, metabolic syndrome, insulin resistance, type 2 diabetes, stroke, peripheral artery disease, obesity, non-alcoholic fatty liver disease (NAFLD)
Actionable Advice
Supplements
- •Omega-3 fish oil (EPA/DHA)
- •Niacin (vitamin B3)
- •Berberine
- •Curcumin
- •Citrus bergamot extract
- •Coenzyme Q10 (CoQ10)
- •Magnesium
- •Vitamin D3
- •Red yeast rice
- •Phosphatidylcholine
Diet & Lifestyle
- •Exercise regularly — aerobic exercise (30-60 min, 5x/week) is the most potent HDL Large particle booster
- •Include healthy fats: olive oil, avocado, nuts, fatty fish
- •Reduce refined carbohydrates and added sugars
- •Maintain a healthy body weight — even modest weight loss increases HDL Large
- •Limit alcohol to moderate intake (1 drink/day women, 1-2 men) — moderate alcohol raises HDL-L
- •Stop smoking — smoking significantly reduces HDL Large particles
- •Consider a Mediterranean or low-glycemic diet pattern
- •Prioritize quality sleep (7-9 hours) — poor sleep impairs HDL function
- •Manage stress through mindfulness, meditation, or regular physical activity
- •Limit trans fats and highly processed seed oils
Ask AI
Ask questions about your HDL Large results, trends, and what you can do to optimize.
Historical Trend
Related Biomarkers
Resources & Studies
All Readings
| Date | Value | Change |
|---|---|---|
| 2026-01-28 | 4486 nmol/L | 0.0 |
| 2025-08-25 | 4486 nmol/L | — |