Vitamin B12 deficiency from the perspective of a practicing hematologist.

  title={Vitamin B12 deficiency from the perspective of a practicing hematologist.},
  author={Ralph Green},
  volume={129 19},
B12 deficiency is the leading cause of megaloblastic anemia, and although more common in the elderly, can occur at any age. Clinical disease caused by B12 deficiency usually connotes severe deficiency, resulting from a failure of the gastric or ileal phase of physiological B12 absorption, best exemplified by the autoimmune disease pernicious anemia. There are many other causes of B12 deficiency, which range from severe to mild. Mild deficiency usually results from failure to render food B12… CONTINUE READING
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