【名词&注释】
细胞内(intracellular)、可能性(possibility)、缺铁性贫血(iron deficiency anemia)、总铁结合力(total iron binding capacity)、纯合子(homozygote)、转铁蛋白饱和度(transferrin saturation)、血清转铁蛋白(serum transferrin)、运铁蛋白饱和度(transferrin saturation)
[单选题]作为诊断血色病的可靠指标,血清转铁蛋白(serum transferrin)饱和度(transferrin saturation)(Tfs)应大于的数值是( )
A. 20%
B. 33%
C. 55%
D. 60%
E. 70%