Single-biomarker blood testVitamin B1 (Thiamine) Blood Test
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Vitamin B1 (Thiamine) Blood Test

£119 ✓ In Stock

What's covered in the price: Laboratory-supplied test kit with sample collection materials and prepaid return packaging. Results turnaround varies by test — see the estimated turnaround time shown above.
Results ready within 10 working days

Your sample goes to a UKAS accredited laboratory meeting ISO 15189 standards.

Date of birth required

After you receive your order confirmation email, please reply with your date of birth.

Blood sample
Clinic visit
(phlebotomy charges apply)
CQC registered Accredited UK labs ISO 15189

How it works

Your testing journey

From order to results in four simple steps. Full transparency on where each step happens and what it costs.

1
Medi Test Direct kit delivered by post

Receive your kit by post

Dispatched same working day if ordered before 3pm. Royal Mail Tracked delivery, typically 1–3 working days. 90% of kits arrive within 24 hours.

2
Clinic sample collection

Visit a partner clinic

Book a phlebotomy appointment at one of our 365+ UK partner clinics. Take your kit with you — the phlebotomist will collect your sample using the materials provided.

Phlebotomy fee applies (paid at clinic)
3
Venous blood draw at a clinic

Venous blood draw at a clinic

A trained phlebotomist takes a small blood sample from a vein in your arm using the vacutainers provided in your kit. The appointment takes around 10 minutes.

4
Return sample by prepaid envelope

Return by prepaid envelope

Seal your sample in the biohazard bag provided and drop it in any Royal Mail postbox using the prepaid Tracked 24 envelope. Post Monday–Thursday for best results.

Vitamin B1 (thiamine) is a water-soluble B vitamin that plays a crucial role in energy metabolism, converting carbohydrates into usable fuel for your body and brain. It is essential for healthy nervous system function, supporting nerve signal transmission and protecting against neurological damage. Thiamine deficiency can manifest as persistent fatigue, muscle weakness, poor concentration, irritability, and in severe cases, conditions like beriberi or Wernicke-Korsakoff syndrome.

This test is particularly valuable if you experience unexplained tiredness, tingling or numbness in your extremities, memory problems, or have risk factors for deficiency such as high alcohol consumption, digestive disorders affecting nutrient absorption, bariatric surgery, or a diet heavily reliant on processed foods. Certain medications including diuretics and some diabetes treatments can also deplete thiamine levels.

What's covered in the price: You receive a venous blood collection kit and professional laboratory analysis. Because this test requires a venous blood draw, you'll need to arrange collection with a qualified phlebotomist—either at a clinic near you or through your own arrangements. A phlebotomy fee may apply separately. Your results will be ready within 10 working days.

Venous Blood Collection Kit

This kit is sent to you and taken to your chosen clinic. The phlebotomist will collect your sample using the materials provided.

  1. 1Vacutainer blood collection tubes
  2. 2Needle and butterfly needle
  3. 3Tourniquet
  4. 4Alcohol swab
  5. 5Cotton wool and gauze
  6. 6Adhesive plaster
  7. 7Biohazard specimen bag
  8. 8Prepaid return envelope (Royal Mail Tracked 24)
  9. 9Laboratory request form
  10. 10Instructions for the phlebotomist
Supplements: Stop taking any B-vitamin or multivitamin supplements for at least 24 hours before your blood draw to ensure accurate baseline measurements. Alcohol: Avoid alcohol for 24 hours before the test, as alcohol can temporarily affect thiamine levels and metabolism. Fasting: Fasting is not required for this test.

Vitamin B1 (thiamine) is a water-soluble B vitamin essential for converting carbohydrates into energy and supporting nervous system function. It acts as a coenzyme in critical metabolic pathways, helping your cells produce ATP—the energy currency of the body. Thiamine is particularly important for brain function, as the brain relies heavily on glucose metabolism. Deficiency can cause fatigue, irritability, poor memory, muscle weakness, and nerve damage. Severe deficiency leads to beriberi (affecting the heart and nervous system) or Wernicke-Korsakoff syndrome (a serious neurological condition often associated with alcoholism). Good dietary sources include whole grains, pork, legumes, nuts, and fortified cereals. Results outside the normal range may need a follow-up with your GP.

Medical Disclaimer

This test is for screening and information only — it is not a medical diagnosis or professional advice. Please have your results reviewed by a qualified doctor or healthcare provider who can explain what they mean for your personal health situation. If your results show anything outside the normal range, or if you're worried about your health, see your doctor as soon as you can. Don't change any medications or treatments based on these results alone — always talk to your healthcare provider first.

NO CLINICS, NO QUEUES, NO HASSLE

Four steps to clarity

Pick your panel 01

Pick your panel

Browse over 200 clinically designed test kits and choose the one that fits your goals.

Kit to your door 02

Kit to your door

Everything you need arrives in discreet packaging with step-by-step instructions inside.

Collect your sample 03

Collect your sample

Follow the simple instructions in your kit — whether it's a finger-prick at home or a venous draw at a partner clinic.

Insights delivered 04

Insights delivered

Clear, easy-to-understand results sent to you online with actionable health guidance.

Frequently asked questions

No. Vitamin levels are not significantly affected by recent food intake.

Thiamine is essential for energy metabolism and nerve function. Deficiency can cause Wernicke's encephalopathy (a neurological emergency), beriberi, and heart failure. Deficiency is more common in people with alcohol dependence, malabsorption conditions, and those on restricted diets.

People with chronic alcohol use, bariatric surgery patients, people with anorexia or severe malnutrition, those on long-term diuretics, and people with chronic vomiting or diarrhoea.

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