男性，46岁。常感胃灼热，解黑便，HGB54g/L，网织红细胞2%，血细胞比容22%，红细胞平均体积73fl，平均血红蛋白浓度(MCHC)0.28,白细胞、血小板正常。该患者的铁代谢检査结果可能为

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