LDL Particle Number
LDL particle number (LDL-P) counts the total LDL particles by NMR or ion mobility, independent of how much cholesterol each particle carries. Because every LDL particle can enter the arterial wall, particle number often predicts cardiovascular events better than LDL cholesterol, particularly when LDL-C and LDL-P are discordant in metabolic syndrome or diabetes.
Units: nmol/L. Check the units on your report before comparing to any range here.
Optimal range: who says what
No institution or named practitioner we track states an optimal target for LDL Particle Number. How we verify ranges.
- Lab reference intervalNo established lab reference interval (assay-specific NMR report)What a lab report flags against. A lab interval is not an optimal target.
5 providers include this
Lipid Panel / Cardiovascular Health
What is LDL Particle Number?
LDL Particle Number (LDL-P) measures the actual number of LDL particles in your blood, rather than the cholesterol content within those particles (which is what standard LDL-C measures). This distinction is crucial because particles cause atherosclerosis, not cholesterol per se. Measured via Nuclear Magnetic Resonance (NMR) spectroscopy or ion mobility analysis, LDL-P provides a direct particle count, expressed in nanomoles per liter (nmol/L).
LDL-P is particularly valuable because two people with identical LDL cholesterol levels can have vastly different particle numbers. Someone with many small cholesterol-poor particles will have high LDL-P despite moderate LDL-C, while someone with fewer large cholesterol-rich particles will have lower LDL-P. The patient with higher LDL-P faces significantly greater cardiovascular risk, as more particles mean more opportunities for atherosclerotic plaque formation.
Research consistently demonstrates that LDL-P predicts cardiovascular events better than LDL-C, particularly in metabolic syndrome, diabetes, and situations where LDL-C and LDL-P are discordant. When LDL-C and LDL-P disagree, LDL-P more accurately reflects true cardiovascular risk. Many advanced lipidology and longevity medicine practices now prioritize LDL-P or ApoB (which closely correlates with LDL-P) over traditional LDL-C for risk assessment and treatment monitoring.
Why LDL Particle Number Is Essential
- Direct count of atherogenic particles, superior to cholesterol measurement
Interpretation bands (curated, PMID-backed)
Holder: OptimizeBiomarkers editorial synthesis of: LDL Particle Number and Risk of Future Cardiovascular Disease in the Framingham Offspring Study - Implications for LDL Management (Cromwell et al., 2007); Clinical implications of discordance between low-density lipoprotein cholesterol and particle number (Otvos et al., 2011); LDL particle number and size and cardiovascular risk: anything new under the sun? (Allaire et al., 2017). No single paper sets these cutoffs; for attributed targets see who says what.
Optimal (Longevity)<700 nmol/L▼
Lowest cardiovascular risk with minimal atherogenic particle count.
Good (Standard)700-1000 nmol/L▼
Acceptable for low-moderate CVD risk individuals.
Very Low<500 nmol/L▼
Very low particle count; typically not concerning.
Elevated>1000 nmol/L▼
Increased atherogenic risk even if LDL-C appears normal.
- LDL Particle Number and Risk of Future Cardiovascular Disease in the Framingham Offspring Study - Implications for LDL Management.
- Clinical implications of discordance between low-density lipoprotein cholesterol and particle number.
- LDL particle number and size and cardiovascular risk: anything new under the sun?
What raises or lowers LDL Particle Number
Causes of high LDL Particle Number
- Genetic factors (familial hypercholesterolemia, familial combined hyperlipidemia)
- Metabolic syndrome
- Insulin resistance
- Type 2 diabetes
- High triglycerides
- Obesity
- High saturated fat diet
- Sedentary lifestyle
- Hypothyroidism
- Nephrotic syndrome
Causes of low LDL Particle Number
- Genetic factors (hypobetalipoproteinemia)
- Aggressive lipid-lowering therapy (desired in prevention)
- Severe malnutrition
- Hyperthyroidism
- Chronic liver disease
Symptoms when LDL Particle Number is high or low
When high
No direct symptoms; elevated LDL-P silently accelerates atherosclerosis over years/decades, eventually manifesting as coronary artery disease, stroke, or peripheral arterial disease
When low
Very low LDL-P (<400 nmol/L) is safe and protective; no known adverse effects when achieved through appropriate medical therapy. Some longevity-focused individuals intentionally achieve these levels.
How to move LDL Particle Number
Effect sizes (how much something moves the marker) appear only where the paper cited under the item states them. Talk to your clinician before starting or changing any medication or supplement.
PCSK9 Inhibitors
Injectable PCSK9 inhibitors (evolocumab, alirocumab) lower LDL further when added to a statin; in the FOURIER trial, evolocumab lowered LDL cholesterol by 59% versus placebo (Sabatine 2017). Reserved for high-risk patients, those with genetic dyslipidemia, or when other therapies are insufficient.
Source: Evolocumab and Clinical Outcomes in Patients with Cardiovascular Disease.
Reduce Carbohydrates and Triglycerides
Lower carbohydrate intake and triglycerides to reduce small dense LDL particle formation. When triglycerides are elevated, VLDL metabolism produces excess small LDL particles. Carbohydrate restriction can shift particle distribution toward larger, less atherogenic particles while reducing total particle number.
Weight Loss and Exercise
Achieve healthy body weight and exercise regularly (150+ minutes weekly). Weight loss and exercise improve insulin sensitivity, reduce triglycerides, and decrease small dense LDL-P. Even without weight loss, exercise enhances LDL particle clearance and improves particle size distribution.
When to retest
Retest 8-12 weeks after starting or adjusting lipid-lowering therapy. Once stable and at goal, retest every 6-12 months. High-risk individuals may test more frequently (every 3-6 months) during optimization. LDL-P testing requires specialized labs (Quest Cardio IQ, LabCorp NMR, or similar).
Scientific Evidence
LDL Particle Number in the Framingham Offspring Study
Among 3,066 Framingham Offspring participants followed a median 14.8 years, NMR-measured LDL particle number was more strongly related to future cardiovascular events than LDL-C or non-HDL-C. People with low LDL-P (below the 25th percentile) had 59 events per 1,000 person-years, versus 81 for an equally low LDL-C.
When LDL-C and LDL-P Disagree
In the Multi-Ethnic Study of Atherosclerosis (6,814 adults), LDL-P and LDL-C were discordant in many people. In the discordant group only LDL-P predicted cardiovascular events (hazard ratio 1.45 per SD, versus 1.07 for LDL-C), and carotid wall thickness tracked LDL-P rather than LDL-C.
LDL-P in the Women's Health Study
In 27,673 initially healthy women followed 11 years, NMR-measured LDL particle concentration predicted cardiovascular disease (hazard ratio 2.51, top versus bottom fifth), but no better than standard lipids or ApoB. Adding LDL-P to the total/HDL cholesterol ratio did not improve risk classification.
Lipoprotein Subfractions and Risk
Krauss reviews LDL and HDL subfraction testing. Some studies link subclass levels to coronary and cerebrovascular disease, but the two largest studies, using NMR and ion mobility, found no improvement in risk assessment over standard lipid tests. Evidence that subfraction testing improves clinical assessment is still inconclusive.
Source: Lipoprotein subfractions and cardiovascular disease risk.
Small Dense LDL and Coronary Disease
In 11,419 ARIC participants followed about 11 years, small dense LDL cholesterol in the top versus bottom quartile carried a hazard ratio of 1.51 for coronary heart disease after adjusting for established risk factors. It still predicted risk (hazard ratio 1.61) in people considered low risk by their LDL-C.
Which Providers Test LDL Particle Number?
Cheapest: Mito Health at $297/year. Most comprehensive: Function Health, 160+ biomarkers for $365/year.
5 panels that include it, cheapest first
| Provider | Annual Cost | Total Biomarkers | $/Biomarker |
|---|---|---|---|
| $297 | 100+ | $2.97 | |
 Superpower | $349 | 100+ | $3.49 |
 Function Health | $365 | 160+ | $2.28 |
| $499 | 100+ | $4.99 | |
| $1188 | 70+ | $16.97 |
$/Biomarker is annual cost divided by the panel's advertised biomarker count, not the price of this one test. We track 23 blood test providers (32 plans); 21 of those plans are itemized marker by marker. Compare all of them.
16 itemized panels do not include LDL Particle Number
WHOOP Advanced Labs · Labcorp OnDemand · Life Extension Elite · Everlywell · InsideTracker · Marek Health Base · Marek Health Comprehensive · Marek Health Complete · Marek Health Executive · Blueprint · Empirical Health · Oura Health Panels · SiPhox Health · Hims Labs · Vitality Blueprint Standard · Vitality Blueprint Elite
11 providers not itemized in our matrix
We have not itemized these marker by marker (some sell tests one at a time), so this page cannot say whether they offer LDL Particle Number. Check with them directly.
Life Extension Standard · Quest Health · Ultrahuman Blood Vision · Lifeforce · Hundred Health · Personalabs · Walk-In Lab · HealthLabs · WHOOP Specialized Panels · Marek Health Essential · Vitality Blueprint Upload
Experts discussing LDL Particle Number
Podcast episodes where clinicians and researchers cover this marker in depth. Curated by hand; an episode is listed only when the marker is a substantial topic, not a passing mention.
Frequently Asked Questions
What is the optimal range for LDL Particle Number?
No institution or named practitioner we track states an optimal target for LDL Particle Number. No established lab reference interval (assay-specific NMR report).
Which blood test providers include LDL Particle Number?
5 of the 21 blood testing panels we itemize marker by marker include LDL Particle Number in their panels. This biomarker has limited availability.
Related: YouBoost rates lifestyle and supplement interventions by evidence; HRV Zone tracks recovery trends.
Medical Disclaimer
This information is for educational purposes only and is not medical advice. Always consult with a qualified healthcare provider about your specific health needs.
Last reviewed Sep 23, 2026 · First published Sep 30, 2025