---
title: VLDL Particle Size Test
type: biomarker
url: "https://www.test-well.com/biomarkers/vldl-particle-size"
also_known_as:
  - vldl particle size
  - vldl size
category: Heart Health
units:
  - nm
reviewed_at: 2026-10-09
---

# VLDL Particle Size

> VLDL Particle Size is measured with a standard blood draw; no fasting is needed. TestWell offers panels that include VLDL Particle Size, drawn at Quest or Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis.

Also known as: vldl particle size, vldl size.

## Key facts

| Fact | Value |
| --- | --- |
| Units | nm |
| Sample | Blood |
| Fasting | Not required |
| Results | 1–3 business days |
| Labs | Quest or Labcorp |

## What does VLDL Particle Size measure?

The average diameter of your VLDL particles; larger VLDL reflects a higher triglyceride load.

## Common questions about VLDL Particle Size

### Do I need a doctor's order to test my vldl particle size?

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 VLDL Particle Size results?

Most VLDL Particle Size 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.

### Where can I order a VLDL Particle Size test?

TestWell offers panels that include VLDL Particle Size alongside related markers. Browse our test catalog to find the panel that fits your goals.

### Do I need to fast before my VLDL Particle Size test?

Fasting is not required for the VLDL Particle Size test. You can have your blood drawn any time of day.

### Which lab will process my VLDL Particle Size 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

- [Testing.com (AACC) — Triglycerides Test](https://www.testing.com/tests/triglycerides/)

## 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 2026-10-09. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md

Canonical page: https://www.test-well.com/biomarkers/vldl-particle-size
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.