Vitamin B12
Vitamin B12 measures the level of cobalamin in your blood. B12 is essential for red blood cell formation, neurological function, and DNA synthesis.
Category: Vitamins & Minerals
Also known as: vitamin b12, b12, cobalamin, vit b12, cyanocobalamin, kobalamin
Reference range: 200–900 pg/mL (Source: ABIM)
Standard unit: pg/mL
High values may indicate
High vitamin B12 levels may indicate liver disease, certain blood cancers (such as leukemia or polycythemia vera), kidney failure, or excessive supplementation.
Low values may indicate
Low vitamin B12 levels may indicate pernicious anemia, dietary deficiency (common in vegans), malabsorption disorders such as celiac disease, or neurological damage including peripheral neuropathy.
Frequently asked questions
- What is a normal Vitamin B12 level?
- A typical reference range for Vitamin B12 is 200–900 pg/mL (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is Vitamin B12 measured in?
- Vitamin B12 is most commonly reported in pg/mL. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do Vitamin B12 reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track Vitamin B12 over time?
- Yes. Upload results from any lab and BloodId charts your Vitamin B12 over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: MedlinePlus, U.S. National Library of Medicine
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