It also can't be statistically a fluke that so many of us are heterozygous... maybe we use iron differently... I do know that the laboratories cannot even agree on what is a safe range. My latest test for ferritin came back 24, reference range 15-180. The last laboratory iron reference range was 20-160. They seem to be more conservative in Canada.
Conversely, a low reticulocyte count in the face of anemia suggests decreased production or release of RBCs (Cohen, 1996), as may be found in bone marrow failure, iron deficiency, lead poisoning, and anemia of inflammation (Hermiston & Mentzer, 2002).
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