随着母亲年龄的增长,双胎妊娠发生率相应增加,曾有报道计算多胎妊发生染色体核型异常的风险。关于染色体异常的风险是多胎妊娠妇女产前咨询的基本内容。有人认为染色体正常的双胎妊娠中期母血清标志物水平大约是单胎妊娠的两倍,由此推测可以通过单胎妊娠染色体异常风险预测值推断双胎妊娠的结果,但是人们对于通过单纯数学变换来推测蚁胎妊娠结果表示怀疑。目前,通过测定胎儿颈部透 As the mother’s age increases, the incidence of twin pregnancies increases correspondingly. There have been reports of the risk of chromosomal abnormalities in multiple pregnancies. The risk of chromosomal abnormalities is a basic prenatal counseling for women with multiple pregnancies. Some people think that chromosomal normal twin gestational maternal serum markers of about twice the level of singleton pregnancies, suggesting that the risk of singleton pregnancies by chromosomal abnormalities predict the outcome of twin pregnancies, but people through a simple mathematical transformation To speculate on the results of ants pregnancy suspect. At present, through the determination of fetal neck through