Buy a vitamin B test: check B12 and folate

A B vitamin deficiency often develops gradually and produces non-specific symptoms, such as fatigue, tingling or difficulty concentrating. Signals like these are hard to place without a measurement.

This vitamin test gives you a snapshot of four commonly measured B vitamins at once. It is not a diagnosis, but preventive insight you can discuss with a doctor alongside your symptoms. For busy professionals, blood testing without a referral can be an efficient first step.

This test may suit people who:

• have symptoms such as fatigue, tingling in hands or feet or difficulty concentrating
• follow a restricted or plant-based diet that may lower the intake of certain B vitamins
• are older, as absorption of some B vitamins may decline with age
• take B vitamin supplements and want to check whether their values fall within expected ranges
• want preventive insight into their B vitamin status

This vitamin blood test measures four B vitamins in your blood:

• Vitamin B12: involved in nerve function, DNA synthesis and the production of red blood cells.
• Folate (vitamin B9): plays a role in cell division and the production of red blood cells.
• Vitamin B1 (thiamine): involved in energy metabolism and nerve function.
• Vitamin B6: plays a role in protein metabolism, immune function and the production of neurotransmitters.

You can read more on the pages about vitamin B12 and folate.

A low vitamin B12 may suggest insufficient intake or absorption and is sometimes associated with fatigue or neurological symptoms; a vitamin B12 test can help bring such a signal into view. Low folate can also play a role in the production of red blood cells.

Vitamin B1 and B6 partly reflect your dietary pattern and may be lower with a one-sided diet. The results can reveal gaps in your B vitamin status and form a starting point for a conversation about nutrition with a doctor.

For this test, blood is drawn at a certified sample point. In the Netherlands you can choose from 700+ locations, which you select yourself after ordering.

You do not need to see your GP first. You pick a location and a time that suit you; the draw is done by trained staff and usually takes only a few minutes.

This test can be useful if you:

• have symptoms that might relate to a B vitamin deficiency, such as fatigue or tingling
• follow a diet that may limit B vitamin intake, such as a vegan or one-sided eating pattern
• take supplements and want to check your values
• want to record your B vitamin status as a baseline

Each value is shown alongside a reference range and a short explanation. Values within range usually suggest adequate levels; a value below it may mean that your intake through food or supplements deserves attention.

A folate test or B12 deficiency test says little on its own: what counts as healthy varies by lab, age and timing. A value above the range can occur with high-dose supplementation. Only a doctor can properly interpret your result.

For this test you usually do not need to fast, and you can pick a time that fits into your day.

Do you take B vitamin supplements? You can generally take them as usual, so the result reflects your typical status, unless your doctor advises otherwise. Coming to your appointment well hydrated can make the draw more comfortable.

Your results are available online within a few working days, with your values alongside the reference ranges and a clear explanation for each vitamin. If a value falls outside the expected range, you will see this highlighted.

Every blood test result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.