---
title: HDL Particle Number Test
type: biomarker
url: "https://www.test-well.com/biomarkers/hdl-particle-number"
also_known_as:
  - hdl particle number
  - hdl-p
  - hdlp
category: Heart Health
units:
  - umol/L
  - "µmol/L"
order_price_usd: 70.99
order_item: Advanced Cholesterol Particle Test (NMR)
order_url: "https://www.test-well.com/tests/nmr-lipoprofile"
reviewed_at: 2026-09-05
---

# HDL Particle Number

> HDL Particle Number is measured with a standard blood draw after an 8–12 hour fast. A typical reference range is 30.5 – 50.0 umol/L. At TestWell it's $70.99 all-in as Advanced Cholesterol Particle Test (NMR), results in 3–5 business days, drawn at Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis.

Also known as: hdl particle number, hdl-p, hdlp.

## Key facts

| Fact | Value |
| --- | --- |
| Units | umol/L / µmol/L |
| Sample | Blood draw |
| Fasting | 8–12 hours |
| Results | 3–5 business days |
| Price | $70.99 |
| Labs | Labcorp |

## What does HDL Particle Number measure?

The actual count of HDL particles. Higher counts are associated with lower cardiovascular risk.

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

| Population | Reference range |
| --- | --- |
| age 18+ | 30.5 – 50.0 umol/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.

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

| Order | Type | Price | Includes |
| --- | --- | --- | --- |
| [Advanced Cholesterol Particle Test (NMR)](https://www.test-well.com/tests/nmr-lipoprofile) | Single test | $70.99 | This marker |

## Quest vs Labcorp vs BioReference

| Lab | Available | Price | Notes |
| --- | --- | --- | --- |
| Quest Diagnostics | No | — | Not offered through Quest for this test. |
| Labcorp | Yes | $70.99 | Choose Labcorp at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. |
| BioReference (NY & NJ) | No | — | Not available in NY/NJ for this test. |

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

## Common questions about HDL Particle Number

### Do I need a doctor's order to test my hdl 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 HDL Particle Number results?

Most HDL 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 HDL Particle Number test cost?

Our Advanced Cholesterol Particle Test (NMR) starts at $70.99. 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 HDL 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 HDL 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

- [Quest Diagnostics](https://testdirectory.questdiagnostics.com/test/test-detail/91716/cardio-iq-ion-mobility-lipoprotein-fractionation)
- [Testing.com (AACC) — HDL Cholesterol Test: What It Measures and Results](https://www.testing.com/tests/hdl-cholesterol/)

## 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)
- [LDL Particle Number](https://www.test-well.com/biomarkers/ldl-particle-number)
- [Small LDL Particle](https://www.test-well.com/biomarkers/small-ldl-particle)

- [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/hdl-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.