Mondo Description Congenital intrinsic factor deficiency (IFD) is a rare disorder of vitamin B12 (cobalamin) absorption that is characterized by megaloblastic anemia and neurological abnormalities.

Uniprot Description Autosomal recessive disorder characterized by megaloblastic anemia.

Disease Ontology Description A vitamin B12 deficiency that is characterized by megaloblastic anemia due to the absence of gastric intrinsic factor which results in abnormal vitamin B12 absorption.