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RDW is red cell distribution width. It measures the variation in red blood cells volume/size. It gets higher when there are anemias based on deficiency in iron, folate or B12. It can also be from blood loss or a heriditary disease called thalassemia intermedia. All by itself, it doesn't mean a whole lot. It is used along with mean corpuscular volume (MCV) to try to distinguish various types of anemia. Since you are having iron infusions, you likely have iron deficiency anemia. That is something your hematologist could tell you.
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MCH is mean corpuscular hemoglobin and will always track along with hemoglobin. Since you have iron deficiency anemia, these numbers don't mean anything except as a method to measure that. It has nothing to do with cancer and doesn't diagnose anything. It's just part of a complete blood count.
It does sound like you are responding to the iron infusions since the hemoglobin is going up. However, you should not get hung up over these other numbers that don't really tell you anything about any other disease process.
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As I mentioned, RDW is the variation in cell size/volume. Since you are undergoing therapy with iron infusions this is understandable. Iron is required to make hemoglobin which is required for red blood cells. As you are getting more iron, you are making more red blood cells and the new cells are smaller than the older ones. This makes for a larger variation in cell size.
Your hematologist should have explained all of this to you.