Diagnostic finding

Decreased Vitamin B12

A subnormal serum cobalamin (vitamin B12) concentration affecting DNA synthesis and neurologic function

  • Deficient: <200 pg/mL or <148 pmol/L

  • Borderline: 200–300 pg/mL or 148–258 pmol/L

Causes

  • Autoimmune pernicious anemia

  • Dietary insufficiency

    • Low intake of animal products

  • Malabsorption

    • Crohn's disease

    • Celiac disease

    • Aging-related malabsorption

  • Bariatric surgery

  • Medications

    • Metformin

    • Proton pump inhibitors (PPIs)

Also known as: Cobalamin deficiency, Hypocobalaminemia, Low vitamin B12, Vitamin B12 deficiency

Referencing diagnoses

Note: Lists existing diagnoses in Diagnotize only.