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[单选] 病人女性，28 岁，因乏力、消瘦、心悸半年就诊。查体：T 37．0℃，P 75 次/分，R 18 次/ 分，BP 110/80mmHg，疑似缺铁性贫血，予查铁相关指标。下列指标中符合缺铁性贫血诊断的是哪一项（）
A．血清铁减少，总铁结合力增加，未饱和铁结合力减少 B．血清铁减少，总铁结合力增加，未饱和铁结合力增加 C．血清铁减少，总铁结合力减少，未饱和铁结合力增加 D．血清铁减少，总铁结合力减少，未饱和铁结合力减少 E．血清铁减少，骨髓铁粒幼细胞减少，未饱和铁结合力减少
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