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Vitamin B12 blood test: what your result means
Vitamin B12 measures a vitamin needed for red blood cell formation and nervous system function.
- Category
- Vitamins
- Standard unit
- pmol/L
- Reported in
- pmol/L, pg/mL, ng/L, pg/dL, pg/100mL, pg% and more
What does high vitamin B12 mean?
Higher values may occur with supplementation or altered metabolism/clearance contexts. What counts as high depends on the reference range printed on your lab report, because ranges differ between laboratories.
What does low vitamin B12 mean?
Lower values may suggest reduced B12 availability and can affect blood and nerve function. What counts as low depends on the reference range printed on your lab report, because ranges differ between laboratories.
Vitamin B12 units and conversion
Mediki shows vitamin B12 in pmol/L. Labs may report it in other units; Mediki converts them automatically so results from different labs line up on one chart.
| Unit on your report | Convert to pmol/L | Convert back |
|---|---|---|
| pg/mL, ng/L | 1 pg/mL = 0.7378 pmol/L | 1 pmol/L = 1.355 pg/mL |
| pg/dL, pg/100mL, pg% | 1 pg/dL = 0.007378 pmol/L | 1 pmol/L = 135.5 pg/dL |
| pg/L | 1 pg/L = 0.0007378 pmol/L | 1 pmol/L = 1,355 pg/L |
Convert a value from your report with the blood test unit converter.
Why track vitamin B12 over time?
A single vitamin B12 result is a snapshot. Comparing it with your earlier tests shows whether a value is stable, slowly drifting, or responding to a change in treatment or lifestyle, which is often more useful than one number on its own.
Read our guide on how to read blood test results to understand reference ranges, flags and units.
Following vitamin B12 as part of a panel? See the vitamin D and B12 tracker.
Track your vitamin B12 results in one chart
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Medical disclaimer: This page is general information, not medical advice. Reference ranges differ between laboratories, and only a doctor can interpret your results in the context of your health.