单项选择题
A.下限为5mmol/L,上限为6mmo/LB.下限为4mmol/L,上限为7mmol/LC.下限为4.5mm……
假定血糖在常规实验室20d测定的质控结果的均数为5.5mmol/L,标准差为0.5mmol/L,如果22s规则,其失控界限为()
A.下限为5mmol/L,上限为6mmo/L
B.下限为4mmol/L,上限为7mmol/L
C.下限为4.5mmol/L,上限为6.5mmol/L
D.下限为4mmol/L,上限为6.5mmol/L
E.下限为3.5mmol/L,上限为7.5mmol/L