Laboratory findings Bonemarrow 1. Erythroid hyperplastia(mide to moderate), polychromatic and ortho-chromatic normoblast make the majorit 2. cytoplasma less mature than cell nucleus 3. Intracellular and extracellular iron stain of bone marrowLaboratory findings Bone marrow： 1.Erythroid hyperplastia(mide to moderate), polychromatic and ortho-chromatic normoblast make the majority 2. cytoplasma less mature than cell nucleus 3.Intracellular and extracellular iron stain of bone marrow (-)