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Vitamins

Vitamin B12 Blood Test: Are Your Levels Optimal?

Vitamin B12 is considered a key nutrient for red blood cell formation, nerve function, and DNA synthesis. Adequate levels may support your overall energy and cognitive health. Consult your healthcare provider for personalised interpretation.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Male Your group
pmol/l
Low 145 Normal 569 High
Female Your group
pmol/l
Low 145 Normal 569 High

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

Vitamin B12: what this test measures

This test measures the total vitamin B12 level in your blood, expressed in pmol/l. It may help assess whether your body has adequate B12 for blood cell production and nervous system maintenance. Your healthcare provider can place results in clinical context.

Vitamin B12: why this value matters

Adequate B12 levels may support overall vitality, cognitive sharpness, and healthy blood cell production. Deficiency can develop gradually and may initially present with subtle symptoms. Regular monitoring can help your healthcare provider track your nutritional status.

Vitamin B12: when is testing worthwhile?

Testing may be recommended when experiencing persistent fatigue, numbness or tingling, difficulty concentrating, or mood changes. Healthcare providers may also suggest testing for vegetarians, vegans, older adults, or those with gastrointestinal conditions affecting absorption.

Vitamin B12: symptoms of a high or low value

Low Levels

Some people with low vitamin B12 may experience fatigue, weakness, pale skin, numbness or tingling in extremities, and difficulty with balance. Mood changes and memory difficulties have also been reported. A healthcare provider can help identify the underlying cause.

High Levels

Elevated vitamin B12 levels may sometimes occur with supplementation or certain medical conditions. While generally considered less concerning than low levels, persistently high B12 may warrant investigation. Your healthcare provider can advise on appropriate follow-up.

Vitamin B12: what to do about an abnormal value

Male

If Low

Low B12 may cause fatigue, neurological symptoms, and anemia. Consider B12 supplementation (1000 mcg daily) or injections if severely deficient.

If High

High B12 is generally not concerning and may indicate recent supplementation. No action needed unless symptomatic.

Female

If Low

Low B12 may cause fatigue, neurological symptoms, and anemia. Consider B12 supplementation (1000 mcg daily) or injections if severely deficient.

If High

High B12 is generally not concerning and may indicate recent supplementation. No action needed unless symptomatic.

Vitamin B12: lifestyle and this value

Foods considered rich in B12 include meat, fish, eggs, and dairy products. Those following plant-based diets may benefit from fortified foods or supplements. Absorption may decrease with age, so regular monitoring could be helpful. Discuss options with your healthcare provider.

Vitamin B12: frequently asked questions

Who is most at risk for vitamin B12 deficiency?
People following vegetarian or vegan diets, older adults, and those with gastrointestinal conditions such as Crohn's disease or celiac disease may be at higher risk. Healthcare providers can help determine your individual risk and recommend appropriate monitoring.
Can vitamin B12 deficiency cause permanent damage?
Prolonged B12 deficiency may potentially lead to irreversible neurological damage in some cases. Early detection and treatment are generally considered important. If you suspect a deficiency, consult your healthcare provider promptly for evaluation and guidance.
How is vitamin B12 deficiency typically treated?
Treatment may include oral supplements, dietary changes, or in some cases injections, depending on the cause and severity. Your healthcare provider can recommend the most appropriate approach based on your individual circumstances and test results.

Test Products

This marker is included in the following test panels.

InsideTracker

InsideTracker

An InsideTracker blood test with 35 biomarkers: heart, hormones, metabolism, inflammation, recovery and iron status. Measured in the Netherlands.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol GGT (Gamma-Glutamyl Transferase) Cortisol DHEA-S Estradiol (E2) Free Testosterone Total Testosterone Folate (Folic Acid) Vitamin B12 Calcium Ferritin Iron (Serum) Magnesium Potassium Progesterone Sodium Transferrin CRP (C-Reactive Protein) Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Total Cholesterol Albumin AST (Aspartate Aminotransferase) Vitamin D (25-OH) Insulin (Fasting) Leukocyte Differential Creatine Kinase (CK) Transferrin Saturation Triglycerides Basic Blood Count
€399,-
Whoop

Whoop Performance Health

A 50-biomarker performance panel inspired by the WHOOP Performance Health Panel — recovery, blood production, thyroid, hormones, iron and nutrient status for people who train.

Complete Blood Count (CBC) Leukocyte Differential ALP (Alkaline Phosphatase) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) Albumin Total Protein Bilirubin (Total) ApoB (Apolipoprotein B) Total Cholesterol LDL Cholesterol HDL Cholesterol Triglycerides Lipoprotein(a) Urea (BUN) Creatinine eGFR (Estimated Glomerular Filtration Rate) Calcium Bicarbonate Chloride Sodium Potassium Magnesium Cortisol DHEA-S Estradiol (E2) FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) SHBG (Sex Hormone Binding Globulin) Total Testosterone Free Testosterone TSH (Thyroid Stimulating Hormone) Glucose (Fasting) HbA1c (Glycated Hemoglobin) Insulin (Fasting) HOMA-IR CRP (C-Reactive Protein) Homocysteine Ferritin Iron (Serum) Transferrin Transferrin Saturation Vitamin D (25-OH) IGF-1 (Insulin-like Growth Factor) Creatine Kinase (CK) Reticulocytes Free T3 (Triiodothyronine) Free T4 (Thyroxine) Vitamin B12 Folate (Folic Acid)
€689,-
Whoop

Whoop Women's Health

A 53-biomarker women's health panel inspired by the WHOOP Women's Health Panel — fertility, cycle and thyroid hormones plus a complete metabolic and nutrient base.

Complete Blood Count (CBC) Leukocyte Differential ALP (Alkaline Phosphatase) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) Albumin Total Protein Bilirubin (Total) ApoB (Apolipoprotein B) Total Cholesterol LDL Cholesterol HDL Cholesterol Triglycerides Lipoprotein(a) Urea (BUN) Creatinine eGFR (Estimated Glomerular Filtration Rate) Calcium Bicarbonate Chloride Sodium Potassium Magnesium Cortisol DHEA-S Estradiol (E2) FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) SHBG (Sex Hormone Binding Globulin) Total Testosterone Free Testosterone TSH (Thyroid Stimulating Hormone) Glucose (Fasting) HbA1c (Glycated Hemoglobin) Insulin (Fasting) HOMA-IR CRP (C-Reactive Protein) Homocysteine Ferritin Iron (Serum) Transferrin Transferrin Saturation Vitamin D (25-OH) AMH (Anti-Müllerian Hormone) Progesterone Prolactin TPO Antibodies Free T3 (Triiodothyronine) Free T4 (Thyroxine) Leptin Vitamin B12 Folate (Folic Acid) Phosphorus
€709,-

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Medical standards

Dr. Naimi oversees the medical standards behind our content and assessments.

Medical policy
CIBG Ministerie van Volksgezondheid,
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Vitamin B12

€33,-