Test library
Thiamine Blood Test
This blood test measures vitamin B1 (thiamine) to evaluate deficiency. Thiamine helps convert carbohydrates into energy and supports nerve and heart function, so low levels can affect several body systems.
Order Vitamin B1 Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Vitamin B1 Test- Typical turnaround
- 1-3 business days
- Starting price
- From $136
- Results
- Confidential, online
Quick answer
The vitamin B1 test measures thiamine, a water-soluble vitamin the body needs to turn carbohydrates into usable energy. Thiamine also supports nerve and heart function. The test is ordered when a deficiency is suspected, such as with poor nutrition, heavy alcohol use, or certain digestive conditions. A blood sample is used, and results are interpreted with symptoms and diet.
What this test measures
Vitamin B1, also called thiamine, acts as a cofactor for enzymes involved in energy metabolism. Without enough of it, cells cannot efficiently process carbohydrates, and tissues with high energy demands such as nerves and the heart are especially affected. Because the body stores only small amounts, a steady dietary supply is important.
The test is often performed on whole blood or as a measure of thiamine pyrophosphate, the active form. Some laboratories use serum or plasma thiamine instead. The collection is a standard blood draw, and the report compares the value with an established reference range for the method used.
Deficiency can develop with prolonged poor intake, heavy alcohol use, or conditions that impair absorption. Early signs may include fatigue, irritability, and tingling, while more advanced deficiency can affect the heart and nervous system. Testing helps a healthcare provider determine whether thiamine status is contributing to symptoms.
- Thiamine (vitamin B1) in whole blood
- Thiamine pyrophosphate (TPP)
- Serum or plasma thiamine
- Thiamine diphosphate
- Erythrocyte transketolase activity
- Related B vitamin markers when ordered together
Why people order this test
- Evaluate suspected thiamine deficiency
- Investigate fatigue or tingling with poor nutrition
- Monitor patients with heavy alcohol use
- Assess absorption after bariatric or digestive surgery
- Check status in prolonged vomiting or poor intake
- Follow up on unexplained nerve or heart symptoms
How to prepare
Fasting is often not required, but the laboratory may request it depending on the method used. A blood sample is collected from a vein, usually at the arm. Follow the timing and preparation instructions provided with the order.
Understanding your results
Results are typically reported within one to three business days. The report shows the thiamine level relative to the reference range. A low value suggests deficiency, and a healthcare provider interprets it together with symptoms, diet, and any risk factors.
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Frequently Asked Questions
What is vitamin B1 used for in the body?
It helps convert carbohydrates into energy and supports the normal function of nerves, muscles, and the heart.
Who is most at risk of thiamine deficiency?
People with heavy alcohol use, poor overall nutrition, malabsorption, or prolonged vomiting may be at higher risk, along with some who have had weight loss surgery.
How is the test performed?
A blood sample is drawn from a vein. Depending on the laboratory, the sample may be analyzed as whole blood or for a specific active form of thiamine.
Do I need to fast before the test?
Fasting is often not necessary, but some laboratories request it. Follow the instructions included with your order.
Can low thiamine cause heart problems?
Severe, prolonged deficiency can affect the heart and circulation. This is uncommon but serious, so concerning symptoms should be evaluated by a healthcare provider.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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