--- title: Vitamin B6 Test type: biomarker url: "https://www.test-well.com/biomarkers/vitamin-b6" also_known_as: - vitamin b6 - pyridoxine - pyridoxal 5-phosphate - pyridoxal-5-phosphate category: Vitamins & Nutrients units: - nmol/L - ng/mL order_price_usd: 51.99 order_item: Vitamin B6 (Pyridoxine) order_url: "https://www.test-well.com/tests/vitamin-b6-pyridoxine" reviewed_at: 2026-09-05 --- # Vitamin B6 > Vitamin B6 is measured with a standard blood draw; no fasting is needed. A typical reference range is 20.0 – 125 nmol/L. At TestWell it's $51.99 all-in as Vitamin B6 (Pyridoxine), results in 3–5 business days, drawn at Quest or Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis. Also known as: vitamin b6, pyridoxine, pyridoxal 5-phosphate, pyridoxal-5-phosphate. ## Key facts | Fact | Value | | --- | --- | | Units | nmol/L / ng/mL | | Sample | Blood draw | | Fasting | Not required | | Results | 3–5 business days | | Price | $51.99 | | Labs | Quest or Labcorp · BioReference in NY/NJ | ## What does Vitamin B6 measure? A B vitamin involved in protein metabolism, neurotransmitter synthesis, and immune function. ## What is the normal range for Vitamin B6? | Population | Reference range | | --- | --- | | age 18+ | 20.0 – 125 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 Vitamin B6 mean? Usually reflects supplement use. Excess can cause nerve damage at high doses. ## What does a low Vitamin B6 mean? Can reflect alcohol use, certain medications, or absorption issues. ## How do you get tested for Vitamin B6? | Order | Type | Price | Includes | | --- | --- | --- | --- | | [Vitamin B6 (Pyridoxine)](https://www.test-well.com/tests/vitamin-b6-pyridoxine) | Single test | $51.99 | This marker | ## Quest vs Labcorp vs BioReference | Lab | Available | Price | Notes | | --- | --- | --- | --- | | Quest Diagnostics | Yes | $51.99 | Choose Quest at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. | | Labcorp | Yes | $51.99 | Choose Labcorp at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. | | BioReference (NY & NJ) | Yes | $51.99 | New York and New Jersey orders route here automatically — state rules keep Quest and Labcorp from accepting self-ordered draws. | - [What a high Vitamin B6 means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/vitamin-b6/high) - [What a low Vitamin B6 means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/vitamin-b6/low) ## Common questions about Vitamin B6 ### Do I need a doctor's order to test my vitamin b6? 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 B6 results? Most Vitamin B6 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 B6 test cost? Our Vitamin B6 (Pyridoxine) starts at $51.99. 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 B6 test? Fasting is not required for the Vitamin B6 test. You can have your blood drawn any time of day. ### Which lab will process my Vitamin B6 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 - [Mayo Clinic Labs](https://www.mayocliniclabs.com/test-catalog/overview/42360) - [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-b6 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.