Vitamin B12

Vitamin B12 is essential for nerve function, red blood cell production, and DNA synthesis.

The concentration of vitamin B12 in the blood.

To assess B12 status, especially in vegans, vegetarians, older adults, and people with certain gastrointestinal conditions.

Results for vitamin b12 are reported as a numerical value with an associated unit of measurement. The unit depends on the laboratory and the assay method used. When comparing results from different labs, always confirm the units match before drawing conclusions about a trend.

This biomarker may be reported in any of the following units:

Reference ranges vary from laboratory to laboratory. They are established by each lab based on its own testing method, equipment, and the population it serves. A result that appears outside the reference range on one lab's report may fall within range on another's.

Ranges can also differ by age, biological sex, and other individual factors. Some labs report multiple reference ranges for different patient groups. Always interpret your result against the reference range printed on the specific lab report, not against a general value you find online.

A result flagged as “out of range” does not by itself indicate a medical condition. Discuss any results that concern you with a qualified healthcare professional.

Diet, supplementation, absorption issues, and certain medications.

A single Vitamin B12 result is a snapshot. Tracking it over time is where the real insight lives. TrackMyMarkers lets you record every result from every lab, automatically aligning units so you can see genuine trends across months and years.

Longitudinal tracking helps you and your healthcare professional spot gradual shifts, see how lifestyle changes correlate with your numbers, and bring clear, organized data to every appointment.

Consider bringing these questions to your next appointment:

• How has my B12 changed?
• Should I consider additional testing like methylmalonic acid?

References and source citations will be added here. In the meantime, the information on this page is intended for general educational purposes and should not replace professional medical advice.