30%

of people with high alcohol intake have thiamine deficiency

Thomson et al., Alcohol & Alcoholism 2012

Good reasons to test

High alcohol intake or alcohol use disorder
Unexplained peripheral neuropathy (tingling, numbness)
Fatigue or cognitive changes

Vitamin B1 (Thiamine)

No fasting required. Any time of day — avoid taking thiamine supplements for at least 24 hours before testing if possible Results arrive in 3-5 business days, explained in plain language in your dashboard. Most results sit within the usual range - that is still useful, and anything unexpected supports a conversation with your healthcare practitioner.

Targeted Testing

B1

Thiamine — the nerve and energy vitamin most commonly depleted by alcohol

$89one-off, no subscription

NATA-accredited pathology
No GP referral needed
Results in 3-5 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, but is rapidly depleted by alcohol, certain medications, and gastrointestinal conditions that impair absorption. Severe deficiency causes Wernicke's encephalopathy — a serious neurological emergency — and is also associated with peripheral neuropathy, fatigue, and cognitive changes.

Understanding your results

Within reference range

Your thiamine level is within the expected range

Low-normal

Within range but on the lower side — dietary adequacy and supplementation may be worth reviewing

Below reference range

Low thiamine warrants prompt discussion with your healthcare practitioner, particularly if you have neurological symptoms

Above reference range

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

TODAY

Order online

Pick a test or panel and check out. No GP referral, no waiting room.

THIS WEEK

One quick visit

Walk into one of 1,900+ NATA-accredited collection centres. A single blood draw is all it takes.

IN 2–5 DAYS

Clear results

We translate your results into plain language in your dashboard - what each marker means, and what is in range.

ONGOING

Track over time

Retest when it matters and watch your trends, so you can see what is actually changing.

Yes. You can order a B1 test online from Clarity Labs without a GP referral. It's $89, collected at any of 1,900+ NATA-accredited centres across Australia, with results in 3-5 business days via your secure online dashboard.

A B1 test is $89 at Clarity Labs — a one-off price with no subscription or membership. That covers your pathology request form and collection at any of 1,900+ NATA-accredited centres nationwide.

If you are taking thiamine supplements, avoid them for at least 24 hours before your blood draw if possible, as they can elevate the result and make it harder to assess your baseline status. Discuss with your healthcare practitioner.

Whole grains, legumes, pork, nuts, and seeds are rich sources of thiamine. Refined grains and processed foods have little thiamine, and cooking can reduce levels further.

Once if investigating a suspected deficiency. After treatment, a repeat in 3-6 months confirms correction. For ongoing risk (high alcohol intake, malabsorption), annually or as directed by your healthcare practitioner.

NATA-accredited pathologyCollected through Sonic Healthcare1,900+ collection centresNo GP referral needed

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This 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.