B1
A vitamin essential to energy metabolism and nerve function.
What is it
Thiamine is essential to carbohydrate metabolism and nerve function. Deficiency is rare in well-nourished populations but can occur with alcohol use or malabsorption.
Why it's measured
Thiamine deficiency has been associated with neurologic and cardiovascular complications in published research.
Reference range
Standard laboratory reference
70 – 180 nmol/L
Reference ranges vary by laboratory. Your individual reference range will appear on your test report and should be interpreted by your physician in the context of your overall health profile.
What results may indicate
Elevated
Generally not clinically concerning.
Lower
Has been associated with neurologic dysfunction in research literature.
These associations are general. They are not a personal diagnosis or prediction. Discuss your individual results with your physician in the context of your full health profile.
When it's measured
Used in evaluating malnutrition, alcohol use disorder, or unexplained neurologic symptoms.
Related markers
Common questions
Thiamine is essential to carbohydrate metabolism and nerve function. Deficiency is rare in well-nourished populations but can occur with alcohol use or malabsorption.
It's one of the markers used to build a fuller picture of your health. On its own it tells you very little, so it's most informative when reviewed alongside related markers.
It's measured from a standard blood draw at Quest or LabCorp. Vitamin B1 (Thiamine) is one of the markers included in the OPTML Apex Panel, where your results are read across systems and reviewed by a U.S.-licensed physician.
Reference ranges vary by laboratory, and a single value rarely tells the whole story. Review your result with a physician in the context of your other markers, symptoms, and history.
Vitamin B1 (Thiamine) is one signal among many. Answer a few quick questions and we’ll point you to the panel that fits.
Measured in
A complete look at your heart, hormones, metabolism, inflammation, and longevity systems — drawn at Quest or LabCorp, reviewed by a U.S.-licensed physician.
Explore the Apex Panel →This information is for general educational purposes only and is not medical advice. Lab results alone are not intended to diagnose, treat, or cure any condition and do not replace the advice of a healthcare provider. OPTML does not offer medical advice, a diagnosis, medical treatment, or any form of medical opinion.