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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]
Megaloblastic erythroid hyperplasia
A laboratory test result indicating an abnormally high quantity of abnormal immature red blood cells with megaloblastic features. [from NCI]
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