For iron deficiency anemia, a complete blood count should first be considered. The blood count presenting as microcytic hypochromic anemia often suggests the possibility of iron deficiency anemia. Microcytic hypochromic anemia is characterized by a decrease in hemoglobin, a decrease in mean corpuscular volume, a decrease in mean corpuscular hemoglobin concentration, and a decrease in mean corpuscular hemoglobin. When the complete blood count indicates the possibility of iron deficiency anemia, further investigation into iron-related indices is required, such as decreased serum iron, decreased ferritin, decreased transferrin saturation, and increased soluble transferrin receptor capacity.