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- May be secondary to antibodies against gastric parietal cells or antibodies against intrinsic factor
- Intrinsic factor is needed to absorb vitamin B12 (cobalamin) in the intestine
- Intrinsic factor is needed to absorb vitamin B12 (cobalamin) in the intestine
Lecture Notes
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Missed Questions
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Pathoma
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Boards and Beyond
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First Aid
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Watch Megaloblastic Anemia Folate Deficiency Vitamin B Deficiency




Watch Gastric Acid Secretion & Regulation







Watch Gastric Secretions




Watch Megaloblastic Anemia Folate Deficiency Vitamin B Deficiency




Watch Gastric Acid Secretion & Regulation







Watch Gastric Secretions
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Watch Macrocytic Anemia DDx









Watch Macrocytic Anemia DDx





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Picmonic
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Physeo
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Bootcamp
Watch associated Bootcamp video - Stomach : Pernicious Anemia
Watch associated Bootcamp video - Physiology : Vitamins
Watch associated Bootcamp video - Macrocytic Anemia: Cobalamin (Vitamin B12) Deficiency
Watch associated Bootcamp video - Vitamins: Introduction to Vitamins
Watch associated Bootcamp video - Stomach : Pernicious Anemia
Watch associated Bootcamp video - Physiology : Vitamins
Watch associated Bootcamp video - Macrocytic Anemia: Cobalamin (Vitamin B12) Deficiency
Watch associated Bootcamp video - Vitamins: Introduction to Vitamins
OME
Additional Resources
- Due to lack of intrinsic factor/B12 absorption (terminal ileum)


- Presents as macrocytic, megaloblastic anemia

- autoimmune destruction of parietal cells (chronic autoimmune gastritis) leads to intrinsic factor deficiency
- other causes include gastrectomy (no IF), veganism, alcoholism, Crohn disease (terminal ileum), ileal resection, blind loop syndrome, Diphyllobothrium latum


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