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Message: <blockquote data-quote="TheBigNewt" data-source="post: 1597204" data-attributes="member: 380756"><p>I think "pernicious anemia" due to B12 deficiency results in a different size hemoglobin molecule (big) than iron deficiency anemia (very small) and they report the sizes in the CBC test. In addition B12 deficiency isn't really due to not taking in adequate B12 in the diet, it's due to lack of "intrinsic factor" which is normally produced by the body and allows B12 to be absorbed in the GI tract from foods. There is no intrinsic factor supplement to take for it, hence the need for intramuscular injections of B12. The OP said her Hgb came up from 9 to 13 with the addition of  FeSO4 pills which wouldn't happen if she was B12 deficient.  BTW I think that there is a diagnostic test for lack of intrinsic factor if my memory serves me.</p></blockquote><p></p>

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