- High alcohol intake or alcohol use disorder
- Unexplained peripheral neuropathy (tingling, numbness)
- Fatigue or cognitive changes
B1
Thiamine, a B vitamin your body uses to break down carbohydrates and keep nerves working
- NATA-accredited pathology
- No GP referral needed
- Results in 3 to 5 business days
- Collect at 1,900+ centres
Why this test
Thiamine (vitamin B1) deficiency can affect neurological function and energy metabolism, and is most common in people with high alcohol intake.
Thiamine is essential for carbohydrate metabolism and nerve function. It is found in whole grains, legumes, meat, and nuts. The body stores very little thiamine, so levels can fall within weeks when intake is poor. Heavy alcohol use, long-term use of some diuretics, and gut conditions or surgery that affect absorption all raise the risk of a shortfall. Severe deficiency is uncommon. It can cause Wernicke's encephalopathy, a neurological emergency that needs urgent medical care and should not wait for a blood test. Deficiency is also associated with peripheral neuropathy, fatigue and cognitive changes, which have many other causes. The blood test is only a guide, and a result in range does not fully rule out a shortfall, so discuss your result with your GP.
Understanding your results
Your thiamine level is within the expected range
Within range but on the lower side — dietary adequacy and supplementation may be worth reviewing
Low thiamine warrants prompt discussion with your healthcare practitioner, particularly if you have neurological symptoms
Elevated thiamine is generally benign and usually reflects supplementation
Reference ranges vary by laboratory and personal context. Your result is shown against the lab's range in your dashboard, alongside what it means.
How it works
Pick a test or panel and check out. No GP referral, no waiting room.
Walk into one of 1,900+ NATA-accredited collection centres. A single blood draw is all it takes.
We translate your results into plain language in your dashboard - what each marker means, and what is in range.
Retest when it matters and watch your trends, so you can see what is actually changing.
Complete your health picture
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$279This information is for general education and is not medical advice, diagnosis, or treatment. Results are best interpreted with a qualified healthcare practitioner in the context of your symptoms and history.