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早在70年代建立了采用羊水穿刺技术进行遗传病的产前诊断,多应用于高风险孕妇,主要包括高龄孕妇(早有证明,母龄在35岁以上者胎儿染色体异常发生率高)以及生过染色体异常、神经管缺陷、代谢病儿等的孕妇。而对年轻孕妇胎儿染色体异常的发生率从未进行过大规模调查。1980年至1984年在丹麦对年龄在25至34岁的孕妇做了登记,总数6935例。排除40例不适合参
As early as the 1970s established prenatal diagnosis of genetic diseases using amniocentesis, and more used in high-risk pregnant women, including older pregnant women (as early proven that the mother’s age over 35 years old fetus with high incidence of chromosomal abnormalities) and health Chromosomal abnormalities, neural tube defects, metabolic sick children and other pregnant women. The incidence of fetal chromosomal abnormalities in young pregnant women has never been large-scale survey. Between 1980 and 1984, pregnant women aged 25 to 34 years were registered in Denmark for a total of 6,935 cases. Exclude 40 cases not suitable for reference