The short answer
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.
Hospital Lab
$150
cash pay
Other Labs
$59
+ lab fees
TestWell
$43.99
+ $6 lab fee
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.
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.
Anyone with restrictive diets (vegan, low-fat, low-carb), malabsorption conditions, fatigue, hair loss, mood changes, or currently supplementing and wanting to verify dosing.
Sample Type
Blood draw
Fasting
Required
Results In
5–10 business days
Performed At
Quest or Labcorp
Your Vitamin B1 (Thiamine) results will include values for each of the 1 biomarker tested, along with reference ranges. Results are reviewed by a licensed physician before being released to your secure portal.
If any values fall outside the normal range, your report will include guidance on what that may mean and recommended next steps. You'll receive an email notification when your results are ready, typically within 5–10 business days.
Typical reference range layout
Lab reports show where your value sits relative to established reference intervals—your physician interprets this in context for you.
Fasting for 8–12 hours is required. Water is okay. Best drawn in the morning before taking any medications.
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. Competitor prices are read from the linked public pages and re-checked regularly; the labs' sites may add taxes or change prices without notice.
Compare more: Quest Diagnostics price list · Labcorp price list · Quest vs Labcorp · Lab test price checker
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
TestWell Price
$43.99
+ $6 lab processing fee at checkout
No insurance needed · HIPAA compliant
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Vitamin B1 (Thiamine)
$43.99