---
title: Vitamin B2 (Riboflavin) Test
type: biomarker
url: "https://www.test-well.com/biomarkers/vitamin-b2-riboflavin"
also_known_as:
  - vitamin b2
  - riboflavin
  - vitamin b2 (riboflavin)
category: Vitamins & Nutrients
units:
  - nmol/L
order_price_usd: 66.99
order_item: Vitamin B2 (Riboflavin)
order_url: "https://www.test-well.com/tests/vitamin-b2-riboflavin"
reviewed_at: 2026-09-05
---

# Vitamin B2 (Riboflavin)

> Vitamin B2 (Riboflavin) is measured with a standard blood draw; no fasting is needed. A typical reference range is 137 – 370 nmol/L. At TestWell it's $66.99 all-in as Vitamin B2 (Riboflavin), 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: vitamin b2, riboflavin, vitamin b2 (riboflavin).

## Key facts

| Fact | Value |
| --- | --- |
| Units | nmol/L |
| Sample | Blood draw |
| Fasting | Not required |
| Results | 3–5 business days |
| Price | $66.99 |
| Labs | Quest |

## What does Vitamin B2 (Riboflavin) measure?

A B vitamin needed for energy production and red blood cell formation.

## What is the normal range for Vitamin B2 (Riboflavin)?

| Population | Reference range |
| --- | --- |
| age 18+ | 137 – 370 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 low Vitamin B2 (Riboflavin) mean?

Can reflect inadequate dietary intake or malabsorption.

## How do you get tested for Vitamin B2 (Riboflavin)?

| Order | Type | Price | Includes |
| --- | --- | --- | --- |
| [Vitamin B2 (Riboflavin)](https://www.test-well.com/tests/vitamin-b2-riboflavin) | Single test | $66.99 | This marker |

## Quest vs Labcorp vs BioReference

| Lab | Available | Price | Notes |
| --- | --- | --- | --- |
| Quest Diagnostics | Yes | $66.99 | 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 low Vitamin B2 (Riboflavin) means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/vitamin-b2-riboflavin/low)

## Common questions about Vitamin B2 (Riboflavin)

### Do I need a doctor's order to test my vitamin b2 (riboflavin)?

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 Vitamin B2 (Riboflavin) results?

Most Vitamin B2 (Riboflavin) 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 Vitamin B2 (Riboflavin) test cost?

Our Vitamin B2 (Riboflavin) starts at $66.99. 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 Vitamin B2 (Riboflavin) test?

Fasting is not required for the Vitamin B2 (Riboflavin) test. You can have your blood drawn any time of day.

### Which lab will process my Vitamin B2 (Riboflavin) 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/14586/vitamin-b2)
- [MedlinePlus (NIH) — Vitamin B Test](https://medlineplus.gov/lab-tests/vitamin-b-test/)

## Related biomarkers

- [Vitamin D, 25-Hydroxy](https://www.test-well.com/biomarkers/vitamin-d-25-hydroxy)
- [Vitamin B12](https://www.test-well.com/biomarkers/vitamin-b12)
- [Methylmalonic Acid](https://www.test-well.com/biomarkers/methylmalonic-acid)
- [Folate](https://www.test-well.com/biomarkers/folate)
- [Vitamin A (Retinol)](https://www.test-well.com/biomarkers/vitamin-a-retinol)
- [Vitamin B1 (Thiamine)](https://www.test-well.com/biomarkers/vitamin-b1-thiamine)

- [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/vitamin-b2-riboflavin
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.