Definition
What Vitamin B12 measures
Vitamin B12 supports red-cell production and nerve function. Blood levels reflect intake — mostly from animal foods or supplements — and absorption, which needs stomach acid and intrinsic factor.
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Nutrient statusEssentialCompletepg/mL
Vitamin B12
The nerve-and-blood vitamin from animal foods
Illustrative sample band · Synthetic
480pg/mL
151Sample target 400–800 pg/mL1,326
Why it matters
How clinicians usually read it
Deficiency can quietly affect energy, cognition, and nerves before anemia appears, and is common with plant-based diets, acid-reducing medications, metformin, and age.
When it reads low
A lower value can mean
A lower B12 can reflect low intake or an absorption issue. Borderline values are sometimes clarified with a methylmalonic acid test before concluding anything.
When it reads high
A higher value can mean
A higher B12 usually reflects supplementation and is rarely a concern from diet. Persistently high unexplained values are occasionally re-checked.
Questions for a clinician
Bring the number into a real conversation
01
Do my diet and medications put me at absorption risk?
02
Should a borderline value here get a methylmalonic acid follow-up?
03
Does my MCV or RDW support a functional deficiency story?
Educational boundary
Educational information only. Displayed ranges are illustrative sample bands, not a diagnosis, treatment plan, or substitute for the contracted laboratory report and a qualified clinician.
See it as a sample result
The sample dashboard shows an illustrative reading, target band, and trend for Vitamin B12.