Vitamin B12 (Cobalamin)
Essential for nerve function, DNA synthesis, and red blood cell formation. Only found naturally in animal products.
Typical normal range
200–900 pg/mL
If high ↑
Rarely concerning; possible liver disease or myeloproliferative disorder
If low ↓
Deficiency: macrocytic anemia, peripheral neuropathy, cognitive decline (vegans at risk)
What is a normal Vitamin B12 level?
A typical reference range is 200–900 pg/mL. Ranges vary between laboratories and can depend on age and sex, so compare your result with the range printed on your own report.
What does a high Vitamin B12 level mean?
Rarely concerning; possible liver disease or myeloproliferative disorder. A single result rarely gives a diagnosis on its own; your doctor will interpret it alongside your symptoms and other tests.
What does a low Vitamin B12 level mean?
Deficiency: macrocytic anemia, peripheral neuropathy, cognitive decline (vegans at risk). Your doctor will interpret it alongside your symptoms and other tests.
About the Vitamins & Minerals
Vitamin and mineral tests look for deficiencies that can cause tiredness, anemia, weak bones or nerve problems. Many are easy to correct once found.
See your own Vitamin B12 result explained
Upload your blood test PDF or a photo. AI Lab Result reads every marker, flags anything outside your lab’s range, and explains it in plain English. Free to start.
Analyze my results freeRelated markers in the Vitamins & Minerals
Medical disclaimer: Reference ranges vary by laboratory, age, sex, and clinical context. This page is for educational purposes only and is not a diagnosis. Always discuss your results with a qualified healthcare professional.