Jones J B, Kelly M
Br J Obstet Gynaecol. 1976 Sep;83(9):720-722. doi: 10.1111/j.1471-0528.1976.tb00920.x.
A standard error of one to two weeks must be accepted if the duration of pregnancy is calculated from serum diamine oxidase (DAO) concentrations. After the 16th week of pregnancy, the enzyme concentration is too variable to be used for calculations of gestational age.
如果根据血清二胺氧化酶(DAO)浓度计算孕期时长,必须接受一到两周的标准误差。妊娠16周后,该酶浓度变化过大,无法用于计算孕周。