--- title: Vitamin B1 (Thiamine) Test type: test id: vitamin-b1 url: "https://www.test-well.com/tests/vitamin-b1-thiamine" price_usd: 43.99 lab_fee_usd: 6 all_in_usd: 49.99 cpt: 84425 category: Vitamins & Nutrients sample: Blood draw fasting_required: true results_in: "5–10 business days" labs: - Quest - Labcorp orderable: true reviewed_at: 2026-09-14 order_url: "https://www.test-well.com/cart?add=vitamin-b1-thiamine&utm_source=ai_agent&utm_medium=markdown" --- # Vitamin B1 (Thiamine) Test > Measures thiamine levels — essential for energy metabolism and nerve function, measured from a standard blood draw. At TestWell it costs $43.99 plus a $6 lab fee, requires an 8–12 hour fast, and results post in 5–10 business days. Physician-authorized with no doctor's visit or insurance needed; draw at Quest or Labcorp. ## Key facts | Fact | Value | | --- | --- | | Price | $43.99 + $6 lab processing fee per order ($49.99 all-in for this test alone) | | CPT code | 84425 | | Sample | Blood draw | | Fasting | Yes — 8–12 hours | | Results | 5–10 business days | | Labs | Quest Diagnostics, Labcorp | | Biomarkers measured | 1 | | Physician authorization | Included — no doctor's visit, referral or insurance needed | | Payment | Card, HSA or FSA; cash-pay only (no insurance billing) | ## What does the Vitamin B1 (Thiamine) test tell you? Measures thiamine levels — essential for energy metabolism and nerve function. Vitamin B1 (thiamine) is essential for converting carbohydrates into energy and maintaining healthy nerve function. Deficiency can lead to beriberi or Wernicke-Korsakoff syndrome, conditions that affect the heart, nervous system, and brain. Thiamine deficiency is more common than often recognized, particularly among individuals with alcohol use disorders, chronic illness, bariatric surgery patients, and those on restrictive diets. **Clinical use:** Vitamin and nutrient testing identifies deficiencies that can drive fatigue, immune dysfunction, neurological symptoms, and long-term disease risk — and confirms that supplementation is working. ## Who should order it? Anyone with restrictive diets (vegan, low-fat, low-carb), malabsorption conditions, fatigue, hair loss, mood changes, or currently supplementing and wanting to verify dosing. ## Biomarkers measured - [Vitamin B1 (Thiamine)](https://www.test-well.com/biomarkers/vitamin-b1-thiamine) ## Price by lab | Lab | Test price | All-in (with $6 fee) | Notes | | --- | --- | --- | --- | | Quest Diagnostics | $43.99 | $49.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | | Labcorp | $43.99 | $49.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | Rhode Island is not served. Prices are identical online and in the lab; no draw fee or physician fee is added. ## How much does a Vitamin B1 (Thiamine) test cost? A Vitamin B1 (Thiamine) test costs $43.99 at TestWell — $49.99 all-in when ordered alone, because the $6 lab processing fee is charged once per order, with no draw fee or physician fee added. Hospital outpatient labs typically bill around $150.00 self-pay for the same test, and often more. With insurance, what you pay depends on your deductible and your plan's negotiated rate; TestWell's price is fixed before the draw and is HSA/FSA-eligible. | Where you order | Price | One test, all-in | Notes | | --- | --- | --- | --- | | TestWell (drawn at Quest or Labcorp) | $43.99 | $49.99 | Includes the one $6 lab processing fee, charged once per order | | Hospital outpatient lab, self-pay (typical) | $150.00 | $150.00 | Reference figure; hospital charges vary widely by facility and are often higher | Lab test codes: Quest test code 10189 · Labcorp test no. 121186. ## How do you prepare? Fasting for 8–12 hours is required. Water is okay. Best drawn in the morning before taking any medications. ## Related conditions - Vitamin deficiency (E56.9) - Nutrient deficiency (E63.9) ## Common questions about the Vitamin B1 (Thiamine) test ### How long do Vitamin B1 (Thiamine) results take? Most Vitamin B1 (Thiamine) results are available in 5–10 business days after your specimen arrives at the lab. You'll get an email the moment results are ready, with everything viewable in your TestWell portal. ### What sample is collected for the Vitamin B1 (Thiamine)? Blood draw. Sample is collected at a Quest, Labcorp, or BioReference patient service center near you, or via at-home phlebotomy where available. ### How much does the Vitamin B1 (Thiamine) cost without insurance? On TestWell, the Vitamin B1 (Thiamine) is $43.99. Quest Direct lists comparable tests at $59. Walk-in hospital labs typically bill $150 or more without insurance. Insurance is not required — pay one all-in price. ### Do I need to fast before the Vitamin B1 (Thiamine)? Yes — fasting for 8–12 hours is required. Water is okay. Best drawn in the morning before taking any medications. Following the prep instructions gives you the most accurate result. ### Where can I get the Vitamin B1 (Thiamine) done? The Vitamin B1 (Thiamine) is available at Quest and Labcorp patient service centers nationwide. Order online at TestWell, pick your preferred lab, and we'll generate a digital requisition for the location closest to you. ## How to order 1. Add to cart: https://www.test-well.com/cart?add=vitamin-b1-thiamine&utm_source=ai_agent&utm_medium=markdown 2. Create an account or sign in, confirm your state and preferred lab, pay by card, HSA or FSA. 3. A licensed physician authorizes the order (usually within minutes); the requisition arrives by email. 4. Walk into any Quest Diagnostics, Labcorp patient service center — no appointment needed at most sites. 5. Results post to your TestWell portal in 5–10 business days with reference ranges and flags. ## Related - [Biotin (Vitamin B7)](https://www.test-well.com/tests/biotin) — $259.99 - [Calcium](https://www.test-well.com/tests/calcium) — $26.99 - [Copper](https://www.test-well.com/tests/copper) — $31.99 - [CoQ10 (Coenzyme Q10)](https://www.test-well.com/tests/coq10-coenzyme-q10) — $74.99 - [Folate (Vitamin B9)](https://www.test-well.com/tests/folate) — $32.99 - [All Vitamins & Nutrients tests](https://www.test-well.com/tests/category/vitamins-nutrients) - [Full test directory](https://www.test-well.com/tests/directory) --- Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-14. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md Canonical page: https://www.test-well.com/tests/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.