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Nutritional
Vitamin B12
Clinical biomarkerVitamin statusBloodpmol/L
A circulating marker used in assessment of vitamin B12 status.
What it measures
Serum/plasma cobalamin concentration.
Why it matters
Used in evaluation of deficiency, often with functional markers when results are ambiguous.
How to interpret it
Interpret with symptoms, blood count and sometimes methylmalonic acid/homocysteine.
Important limitations
Serum concentration alone can be misleading in some settings.
Evidence status
Clinical biomarker
Established nutritional biomarker.
Research & guidance
Original papers, validation studies, reviews and clinical guidance connected to this measurement.
For education and evidence exploration, not diagnosis or individualized medical advice.