What Is a Vitamin B12 Blood Test?
Vitamin B12 is essential for DNA, red cells, and neurological function.
Normal Range
- 200–900 pg/mL
- Below 200: deficient
- 200–400: borderline — check MMA
Symptoms
- Macrocytic anemia
- Peripheral neuropathy
- Memory impairment
- Glossitis
Causes
- Pernicious anemia
- Vegan diet
- Malabsorption
- Metformin, PPIs
- Age
Source: NLM MedlinePlus, American Association for Clinical Chemistry.
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