<s>[INST] I have an 11 year old son. He has been sick since April. He had a Hgb of 7 and total iron 12, Ferritin 2. Checked by gastroenterology and no sign of bleeding. Hematologist diagnosed iron deficiency anemia. Takes 170 mg elemental iron daily. Within 2 weeks, iron levels normal. His last blood work came back and the MCV, MCH, MCHC remain LOW. No change. This time his RBC are too high and his eosinophil count continues to rise to 730. He still has toxic granulation. His reticulate count is .8 and his platelets are down in the normal range now. His WBC went from 4 to 6.4. What is happening and what does this mean. I don t think that iron deficiency anemia is the cause of the small red cells. His Hgb is now 12 which is good. What does this mean and what should we be doing or looking for to get him back to normal? [/INST] Hi  Iron deficiency is no one cause of small RBCs .If Pheripheral blood film of you baby is normal , his hemoglobin is increasing with iron , his examination is normal , it will take 2-3 months of iron therphy for RBCs to be normal.thanks </s>