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Hereditary intrinsic factor deficiency
Intrinsic factor deficiency (IFD), or congenital pernicious anemia, is a rare disorder characterized by the lack of gastric intrinsic factor in the presence of normal acid secretion and mucosal cytology and the absence of GIF antibodies that are found in the acquired form of pernicious anemia (170900). See also pernicious anemia due to defect in the receptor for vitamin B12/intrinsic factor (261100). [from OMIM]
Intrinsic factor and r binder, combined congenital deficiency of
Absence of intrinsic factor
Absence of gastric intrinsic factor, which is normally produced by the parietal cells of the stomach, and is required for the absorption of vitamin B12. [from HPO]
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