Nursing Central: Vitamin B12

Vitamin B12

General

Synonym/Acronym:
Cyanocobalamin.

Common Use:
To assess vitamin B₁₂ levels to assist in diagnosing disorders such as pernicious anemia and malabsorption syndromes.

Specimen:
Serum (1 mL) collected in a red- or tiger-top tube.

Normal Findings:
(Method: Immunochemiluminescent assay)

Age	Conventional Units	SI Units (Conventional Units × 0.738)
Newborn–11 mo	160–1,300 pg/mL	118–959 pmol/L
Adult	200–900 pg/mL	148–664 pmol/L
Values tend to decrease in older adults.

Vitamin B12 has been found in Davis's Lab & Diagnostic Tests

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