Vitamin B12 deficiency

Vitamin B12 deficiency is a topic covered in the Diagnosaurus.

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Etiology

  • Dietary deficiency (seen in vegans)
  • Decreased intrinsic factor production: pernicious anemia, gastrectomy
  • Competition for B12 in gut: blind loop syndrome, fish tapeworm (rare)
  • Decreased ileal B12 absorption: surgical resection, Crohn's disease, metformin
  • Pancreatic insufficiency
  • Helicobacter pylori infection
  • Transcobalamin II deficiency (rare)

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Last updated: December 1, 2014

Citation

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TY - ELEC T1 - Vitamin B12 deficiency ID - 114646 A1 - Zeiger,Roni F, Y1 - 2014/12/01/ BT - Diagnosaurus UR - https://emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114646/all/Vitamin_B12_deficiency PB - McGraw-Hill Education ET - 4 DB - Emergency Central DP - Unbound Medicine ER -