Some patients with iron deficiency anemia will have reduced white blood cells. Iron deficiency anemia is a small cell hypochromic anemia, and laboratory blood tests can reveal that the red blood cell count and hemoglobin concentration are lower than normal, and the white blood cell and platelet counts are normal or reduced, while the mean red blood cell volume, mean red blood cell hemoglobin content, and mean red blood cell hemoglobin concentration can be found to be less than the normal reference values. In the blood film, small erythrocyte volume, enlarged central lightly stained area, reticulocytes mostly normal or mildly increased, active or apparently active bone marrow picture proliferation, mainly red lineage proliferation, bone marrow iron staining showed the disappearance of small grain stainable iron in bone marrow, and iron granule juvenile cells <0.15.