The clinical manifestations of iron deficiency anemia are due to the specific characteristics of anemia caused by iron deficiency and the underlying disease causing the iron deficiency. Its hematological characteristics present as typical microcytic hypochromic anemia. What does this concept mean? It refers to the values in a complete blood count where MCV is less than 80 femtoliters, MCH is less than 27 picograms, and MCHC is less than 30%. MCV refers to the average red blood cell volume, MCH refers to the mean corpuscular hemoglobin concentration, and MCHC refers to the mean corpuscular hemoglobin concentration of red blood cells. The extent of changes in red blood cell indices correlates with the duration and severity of anemia. The blood smear typically shows pale-stained red blood cells with an enlarged central pallor and varying sizes. Platelet count often tends to be high when there is concurrent bleeding and generally tends to be low in infants and children. White blood cell count is usually normal or slightly reduced, with normal differential. These are the hematological characteristics of iron deficiency anemia.