Vitamin B12
Vitamin B12 measures circulating cobalamin and is reported alongside B12-pathway measures. Across US males aged 30 to 39, the median serum vitamin B12 in NHANES 2013-2014 is 500 pg/mL.
Unit: pg/mL · 12 slices · age and sex · 1 source
Filed under panels: Vitamins · topics: Nutrition
Serum vitamin B12 measures circulating cobalamin. LabNorms reports it separately from methylmalonic acid because serum concentration and downstream B12-pathway biology are related but not interchangeable. Values shown here come from the NHANES 2013-2014 vitamin B12 file (VITB12_H), used because vitamin B12 was not published in the NHANES 2017-2018 or 2017-March 2020 public lab files.
Population Distribution
Browse by Demographic
| Age (years) | male (pg/mL) | female (pg/mL) |
|---|---|---|
| 20-29 | 283–934 (515) | 245–894 (493) |
| 30-39 | 286–975 (500) | 237–1123 (477) |
| 40-49 | 255–937 (490) | 234–1269 (487) |
| 50-59 | 255–1255 (482) | 240–1531 (544) |
| 60-69 | 236–949 (482) | 266–1631 (582) |
| 70+ | 190–1487 (521) | 228–1855 (589) |
Frequently Asked Questions
Why does vitamin B12 use NHANES 2013-2014?
NHANES did not publish a vitamin B12 lab file in 2017-2018 or the 2017-March 2020 pre-pandemic release. LabNorms uses the 2013-2014 serum B12 file with the matching two-year MEC weight and documents the older cycle on every page.
Why is methylmalonic acid listed as a related marker?
Methylmalonic acid is part of the B12 pathway and can move differently from serum B12. The two markers describe related but distinct population distributions.
Are these laboratory reference intervals?
No. These values are survey-weighted population percentiles for US adults in NHANES 2013-2014.