Free tool
Vitamin B12 level & range checker
Enter your serum vitamin B12 result in pg/mL to see it converted to pmol/L and checked against the standard adult normal range chart. Nothing is stored or sent.
Your result
General information only, not a diagnosis. Reference ranges vary by lab, method, age and sex, and this tool uses a commonly used adult range. Go by the range and flag printed on your own lab report, and discuss your result with your doctor.
Reference chart
Standard adult vitamin B12 range chart
These are commonly used adult serum B12 reference bands, matching what most Indian lab reports show. Your own lab's printed range is the one that applies to your report.
| Category | pg/mL | pmol/L |
|---|---|---|
| Deficient | Below 200 | Below 148 |
| Borderline | 200 to 300 | 148 to 221 |
| Normal | 300 to 900 | 221 to 664 |
| High | Above 900 | Above 664 |
A borderline result does not confirm or rule out deficiency on its own. Doctors often add tests such as methylmalonic acid (MMA) or homocysteine, and weigh symptoms and diet, before deciding on next steps. Pregnancy and some lab methods can shift what counts as normal; your lab report and doctor override this general table.
Questions
What is a normal vitamin B12 level?
For most healthy adults, a serum vitamin B12 level of 300 to 900 pg/mL (about 221 to 664 pmol/L) is generally considered normal. Below 200 pg/mL (about 148 pmol/L) is usually flagged as deficient, and 200 to 300 pg/mL falls in a borderline zone that many labs and doctors investigate further. These are standard adult reference bands: your own lab report may print a slightly different range depending on the method used.
What does a borderline or low normal B12 result mean?
A result between 200 and 300 pg/mL sits in a grey zone. Some people in this range have no deficiency at all, while others already show early signs of B12 deficiency that the serum level alone does not catch. Doctors often follow up a borderline result with additional tests, such as methylmalonic acid (MMA) or homocysteine, along with the person’s symptoms and diet. Go by what your doctor recommends, not this range alone.
Can a high vitamin B12 level be a problem?
A high B12 result, generally above 900 pg/mL, is not usually caused by eating B12-rich food or taking a standard supplement, since the body excretes what it does not need. It can show up with B12 injections or high-dose supplements, and less commonly with liver conditions or other underlying causes. A high reading on its own is general information, not a diagnosis: discuss it with your doctor if you were not already supplementing.
Run a diagnostic lab?
HealthFlow generates vitamin B12 reports like this, automatically
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See the full report engine on the lab information system page →
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