Vitamin B12 pmol/L → pg/mL
Convert vitamin b12 from pmol/L to pg/mL
Sources last checked: 2026-11-03
Vitamin B12 pmol/L → pg/mL
Convert vitamin b12 from pmol/L to pg/mL
Converts units only; reference ranges depend on the laboratory, the assay and the patient.
What is the Vitamin B12 pmol/L → pg/mL?
Many European laboratories report total serum vitamin B12 in pmol/L, whereas Turkey, the USA and many German-speaking laboratories use pg/mL (= ng/L). This converter divides by 0.7378 (about × 1.355), the factor derived from the molar mass of cyanocobalamin (1355.4 g/mol) and used in SI conversion tables.
When to use it
- Translating a pmol/L B12 result into the pg/mL unit your laboratory uses
- Reading US or Turkish literature that reports B12 in pg/mL
- Comparing results after switching laboratories
- Teaching and exam preparation
When not to use it
- Holotranscobalamin, which is a separate test usually kept in pmol/L
- Methylmalonic acid (often in nmol/L or µmol/L) — it is a different molecule and needs no B12 conversion
- Assessing B12 status in isolation from the blood count, neurology and functional markers
How it is calculated
Vitamin B12 (pg/mL) = vitamin B12 (pmol/L) ÷ 0.7378
Clinical pearls and limitations
- Converts units only; reference ranges depend on the laboratory, the assay and the patient.
- 1 pmol/L ≈ 1.355 pg/mL; 250 pmol/L ≈ 339 pg/mL.
- Round pg/mL to whole numbers.
- Recent B12 injections or high-dose supplements raise serum B12 and limit interpretation.
- Different immunoassays give systematically different B12 values; reference intervals come from the reporting laboratory.
Frequently asked questions
How do I convert vitamin B12 from pmol/L to pg/mL?
Divide by 0.7378. For example, 250 pmol/L ÷ 0.7378 = 339 pg/mL and 500 pmol/L ÷ 0.7378 = 678 pg/mL.
What is 1 pmol/L of B12 in pg/mL?
About 1.355 pg/mL, from the molar mass of cyanocobalamin (1355.4 g/mol).
My report says ng/L — do I need to convert to pg/mL?
No. ng/L and pg/mL are numerically identical, because 1 ng/L = 1000 pg per 1000 mL.
Evidence and guidelines
Have a follow-up question?
Medelix answers clinical questions from current guidelines and studies — every statement with its source.
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<p><a href="https://medelix.ai/en/calculators/vitamin-b12-pmol-l-to-pg-ml">Vitamin B12 pmol/L → pg/mL calculator by Medelix</a></p>For healthcare professionals and medical students. These tools support, and do not replace, clinical judgement. Always check results against the original source and your local protocols.