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Iron deficiency S P-thalassemia Hemoglobin H Red cell fragmentation

Early iron or folate deficiency Mixed deficiencies Hemoglobinopathy (e.g., SS) Myelofibrosis Sideroblastic anemia

Folate deficiency Vitamin B12 deficiency Immune hemolytic anemia Cold agglutinins

Abbreviations: MCV, mean corpuscular volume; RDW, red cell distribution width, which is the coefficient of variation of RBC distribution width (normal: 11.5-14.5%).

Abbreviations: MCV, mean corpuscular volume; RDW, red cell distribution width, which is the coefficient of variation of RBC distribution width (normal: 11.5-14.5%).

*Reticulocyte index = reticulocyte count x (patient's hematocrit/normal hematocrit). For example, for a reticulocyte count of 6% and hematocrit of 15%, the reticulocyte index = 6 x (15/45) = 2%.

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