Vitamin B12 deficiency

Vitamin B12 deficiency is a topic covered in the Diagnosaurus.

To view the entire topic, please or purchase a subscription.

Emergency Central is a collection of disease, drug, and test information including 5-Minute Emergency Medicine Consult, Davis’s Drug, McGraw-Hill Medical’s Diagnosaurus®, Pocket Guide to Diagnostic Tests, and MEDLINE Journals created for emergency medicine professionals. Explore these free sample topics:

Emergency Central

-- The first section of this topic is shown below --


  • 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)

-- To view the remaining sections of this topic, please or purchase a subscription --

Last updated: December 1, 2014


* When formatting your citation, note that all book, journal, and database titles should be italicized* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - Vitamin B12 deficiency ID - 114646 A1 - Zeiger,Roni F, Y1 - 2014/12/01/ BT - Diagnosaurus UR - PB - McGraw-Hill Education ET - 4 DB - Emergency Central DP - Unbound Medicine ER -