Vitamin B1 (Thiamine) — What It Means in Your Blood Test
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Thiamine helps your body turn food into energy and keeps your nerves and heart working well.
A Vitamin B1 (Thiamine) result reflects your current supply of this nutrient. It matters because turning meals into usable fuel, and keeping your heart and nerves humming, all depend on having enough.
Also known as: thiamine, thiamin, vitamin B1, aneurine, thiamine pyrophosphate
This isn't a case where higher or lower is better. Your body keeps it in a narrow band, and both directions can matter.
Last reviewed: 2026-08-16
What is Vitamin B1 (Thiamine)?
Thiamine, or vitamin B1, dissolves in water and acts as a helper that lets your cells release energy from carbohydrates. Nerve and heart tissue rely heavily on that energy, so this test measures your level.
Why is Vitamin B1 (Thiamine) tested?
Your doctor may order this test if you drink heavily or have poor nutrition, which both raise the risk of a shortage.
What is a normal Vitamin B1 (Thiamine) range?
- India
- No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison.
- Global
- Normal (whole blood thiamine): 70–180 ng/mL (CLSI-aligned laboratory reference)
Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.
Source: [Institute of Medicine, 1998]
What does your Vitamin B1 (Thiamine) value mean?
There is no widely-accepted set of value bands for this parameter. Compare your result with the reference range printed on your own report, and discuss it with your doctor.
What does a high Vitamin B1 (Thiamine) result mean?
A high level is rare from food and usually reflects supplements. It is not generally linked to any harm.
What does a low Vitamin B1 (Thiamine) result mean?
A low level can leave you tired and, over time, damage your nerves. A severe shortage can affect your heart and nervous system, a condition called beriberi.
What can affect your Vitamin B1 (Thiamine) result?
- Whole grains and beans
- Long-term heavy drinking
- Long cooking times
- Dialysis or water pills
- Relying on polished rice
In the Indian context
In India, relying heavily on polished rice can raise the risk of a thiamine shortage. ICMR diet guidelines suggest whole grains to lower this risk.
Questions to ask your doctor
About this result
- What does my Vitamin B1 (Thiamine) result mean for me specifically, given my age and health?
- Is my Vitamin B1 (Thiamine) in the range that is right for me, not just the lab's general range?
What to do next
- Could anything I eat, do, or take have affected my energy metabolism vitamin result?
- Is there anything I should do about my Vitamin B1 (Thiamine), or is it fine to leave as it is?
About retesting
- Does my Vitamin B1 (Thiamine) need to be repeated, and if so, when?
- The typical range for Vitamin B1 (Thiamine) can vary between labs — should I compare my result against my own lab's printed range?
The bigger picture
- Should my Vitamin B1 (Thiamine) be looked at together with my Vitamin D (25-OH) and Vitamin B12 result?
- Does my Vitamin B1 (Thiamine) connect to any condition I already have, or to anything I have noticed in how I feel?
Frequently asked questions
- What is Vitamin B1 (Thiamine)?
- Thiamine, or vitamin B1, dissolves in water and acts as a helper that lets your cells release energy from carbohydrates. Nerve and heart tissue rely heavily on that energy, so this test measures your level. Your doctor may order this test if you drink heavily or have poor nutrition, which both raise the risk of a shortage.
- What is a normal energy metabolism vitamin range?
- A typical adult range is around Normal (whole blood thiamine): 70–180 ng/mL (CLSI-aligned laboratory reference). No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison. Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.
- What does a high Vitamin B1 (Thiamine) result mean?
- A high level is rare from food and usually reflects supplements. It is not generally linked to any harm.
- What does a low Vitamin B1 (Thiamine) result mean?
- A low level can leave you tired and, over time, damage your nerves. A severe shortage can affect your heart and nervous system, a condition called beriberi.
- What can affect your Vitamin B1 (Thiamine) result?
- Several everyday factors can influence it, including Whole grains and beans, Long-term heavy drinking, Long cooking times, Dialysis or water pills, Relying on polished rice.
Sources
- Institute of Medicine (1998) — Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline
Part of the Vitamins
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