Biomarker education
Vitamin B12: What It Measures & Why People Track It
Also called: B12, Cobalamin
Vitamin B12 is measured to look at levels of this vitamin, often alongside folate.
General biomarker education — not personalized medical advice. Learn more
Result on your report
IllustrativeVitamin B12
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Range: Low – High
LowReference intervalHigh
What it generally measures
Labs report the concentration of vitamin B12 (cobalamin) circulating in the blood.
Common units on reports: pg/mL
Why people track it over time
People often recheck B12 after dietary or supplementation changes discussed with a clinician. This page does not tell you whether to supplement.
Changes over time do not by themselves establish a diagnosis. Learn more
Questions you might ask a healthcare professional
Questions to bring
IllustrativeAsk which reference range applies on your report and how it compares with prior results.
Discuss diet, supplements, or absorption questions with your clinician rather than changing them on your own.
Related markers
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