Laboratory findings Peripheral blood ALHBL 2. Microcytic hypochromic anemia MCV< 80f1, MCH 26pg, MCHC<32% 3. Red blood cell distribution width(RDW)N 4. Reticulocyte count: normal or mild increaseLaboratory findings Peripheral blood: 1.HB↓ 2.Microcytic hypochromic anemia： MCV< 80fl, MCH< 26pg, MCHC<32% 3.Red blood cell distribution width (RDW) ↑ 4.Reticulocyte count：normal or mild increase