--- title: Vitamin B1 (Thiamine) Test type: biomarker url: "https://www.test-well.com/biomarkers/vitamin-b1-thiamine" also_known_as: - vitamin b1 - thiamine - vitamin b1 (thiamine) category: Vitamins & Nutrients units: - nmol/L order_price_usd: 43.99 order_item: Vitamin B1 (Thiamine) order_url: "https://www.test-well.com/tests/vitamin-b1-thiamine" reviewed_at: 2026-09-05 --- # Vitamin B1 (Thiamine) > Vitamin B1 (Thiamine) is measured with a standard blood draw after an 8–12 hour fast. A typical reference range is 70.0 – 180 nmol/L. At TestWell it's $43.99 all-in as Vitamin B1 (Thiamine), results in 5–10 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 b1, thiamine, vitamin b1 (thiamine). ## Key facts | Fact | Value | | --- | --- | | Units | nmol/L | | Sample | Blood draw | | Fasting | 8–12 hours | | Results | 5–10 business days | | Price | $43.99 | | Labs | Quest or Labcorp | ## What does Vitamin B1 (Thiamine) measure? A B vitamin essential for energy metabolism and nerve function. ## What is the normal range for Vitamin B1 (Thiamine)? | Population | Reference range | | --- | --- | | age 18+ | 70.0 – 180 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 B1 (Thiamine) mean? Can reflect alcohol use, malnutrition, or absorption issues. Severe deficiency causes beriberi. ## How do you get tested for Vitamin B1 (Thiamine)? | Order | Type | Price | Includes | | --- | --- | --- | --- | | [Vitamin B1 (Thiamine)](https://www.test-well.com/tests/vitamin-b1-thiamine) | Single test | $43.99 | This marker | ## Quest vs Labcorp vs BioReference | Lab | Available | Price | Notes | | --- | --- | --- | --- | | Quest Diagnostics | Yes | $43.99 | Choose Quest at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. | | Labcorp | Yes | $43.99 | 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 low Vitamin B1 (Thiamine) means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/vitamin-b1-thiamine/low) ## Common questions about Vitamin B1 (Thiamine) ### Do I need a doctor's order to test my vitamin b1 (thiamine)? 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 B1 (Thiamine) results? Most Vitamin B1 (Thiamine) 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 B1 (Thiamine) test cost? Our Vitamin B1 (Thiamine) starts at $43.99. 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 B1 (Thiamine) 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 Vitamin B1 (Thiamine) 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/42356) - [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 B2 (Riboflavin)](https://www.test-well.com/biomarkers/vitamin-b2-riboflavin) - [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-b1-thiamine 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.