患者，男，34岁。乏力、皮肤苍白半年，实验室检査:Hb76g/L，血清铁5.95μmol/L，总铁结合力87.54μmol/L，转铁蛋白饱和度12%，MCV60fl，MCH24pg,MCHC22%，血清铁蛋白10μg/L。该患者的诊断是

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