---
title: LDL Particle Number Test
type: biomarker
url: "https://www.test-well.com/biomarkers/ldl-particle-number"
also_known_as:
  - ldl particle number
  - ldl-p
  - ldlp
category: Heart Health
units:
  - nmol/L
order_price_usd: 90.99
order_item: Advanced Lipid Panel
order_url: "https://www.test-well.com/tests/advanced-lipid-panel"
reviewed_at: 2026-09-05
---

# LDL Particle Number

> LDL Particle Number is measured with a standard blood draw after an 8–12 hour fast. A typical reference range is 0.000 – 1000 nmol/L. At TestWell it's $90.99 all-in as Advanced Lipid Panel, results in 3–5 business days, drawn at Quest. An out-of-range result is a prompt to look closer, not a diagnosis.

Also known as: ldl particle number, ldl-p, ldlp.

## Key facts

| Fact | Value |
| --- | --- |
| Units | nmol/L |
| Sample | Blood draw |
| Fasting | 8–12 hours |
| Results | 3–5 business days |
| Price | $90.99 |
| Labs | Quest |

## What does LDL Particle Number measure?

The actual count of LDL particles. A more direct measure of atherogenic burden than LDL cholesterol.

## What is the normal range for LDL Particle Number?

| Population | Reference range |
| --- | --- |
| age 18+ | 0.000 – 1000 nmol/L |

Reference intervals differ slightly between labs; the range printed on your report is the one to interpret against. Ranges are usually set so 95% of healthy people fall inside them.

## What does a high LDL Particle Number mean?

Above 1000 nmol/L is considered above optimal; above 1600 is high. A leading risk marker when LDL-C and LDL-P disagree.

## How do you get tested for LDL Particle Number?

| Order | Type | Price | Includes |
| --- | --- | --- | --- |
| [Advanced Lipid Panel](https://www.test-well.com/tests/advanced-lipid-panel) | Single test | $90.99 | This marker |

## Quest vs Labcorp vs BioReference

| Lab | Available | Price | Notes |
| --- | --- | --- | --- |
| Quest Diagnostics | Yes | $90.99 | Choose Quest at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. |
| Labcorp | No | — | Not offered through Labcorp for this test. |
| BioReference (NY & NJ) | No | — | Not available in NY/NJ for this test. |

- [What a high LDL Particle Number means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/ldl-particle-number/high)

## Common questions about LDL Particle Number

### Do I need a doctor's order to test my ldl particle number?

No. TestWell's licensed physician network reviews and approves your order — usually within minutes. You can place an order online without an in-person visit or a referral from your own doctor.

### How long does it take to get LDL Particle Number results?

Most LDL Particle Number results are available in 1–3 business days after your specimen arrives at the lab. You'll get an email the moment your results are ready, with everything viewable in your TestWell portal.

### How much does a LDL Particle Number test cost?

Our Advanced Lipid Panel starts at $90.99. That's the all-in price — no copays, no insurance hoops, no surprise bills. HSA and FSA cards are accepted.

### Do I need to fast before my LDL Particle Number test?

Yes — for the most accurate result, fast for 8–12 hours before your blood draw. Water is fine; coffee, food, and supplements are not. Your prep instructions will be included with your order.

### Which lab will process my LDL Particle Number test?

Your test will be processed by Quest Diagnostics, Labcorp, or BioReference depending on which is closest to you and which lab carries the test. All three are CLIA-certified and trusted by hospitals nationwide. You'll choose your lab during checkout from 4,000+ locations.

## Sources

- [American Heart Association](https://www.ahajournals.org/doi/10.1161/CIR.0000000000000625)
- [Testing.com (AACC) — LDL-P Test: A LDL Particle Number](https://www.testing.com/tests/ldl-particle-testing/)

## Related biomarkers

- [Apolipoprotein B](https://www.test-well.com/biomarkers/apolipoprotein-b)
- [Lipoprotein(a)](https://www.test-well.com/biomarkers/lipoprotein-a)
- [NT-proBNP](https://www.test-well.com/biomarkers/nt-probnp)
- [Homocysteine](https://www.test-well.com/biomarkers/homocysteine)
- [Small LDL Particle](https://www.test-well.com/biomarkers/small-ldl-particle)
- [LDL Particle Size](https://www.test-well.com/biomarkers/ldl-particle-size)

- [Reference range lookup tool](https://www.test-well.com/tools/reference-range-lookup)
- [Lab unit converter](https://www.test-well.com/tools/lab-unit-converter)
- [All biomarkers](https://www.test-well.com/biomarkers)

---

Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-05. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md

Canonical page: https://www.test-well.com/biomarkers/ldl-particle-number
Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt

Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.