对于有一个婴儿有染色体异常、神经管缺陷或代谢病的高危妊娠妇女,进行遗传的羊膜穿刺,已成为一种常规的预防性检查方法。羊膜穿刺术最普通的适应症是高龄孕妇。在丹麦,母亲的年龄限制在末次月经时为35岁。本文研究的目的,是对年轻低危孕妇染色体异常的发病率进行分析。6305名妊娠妇女,年龄25～34岁,估计她们的胎儿不会增加遗传性疾病的危 Genetic amniocentesis has become a routine, preventative test for women at high risk of having a baby with chromosomal abnormalities, neural tube defects, or metabolic disorders. Amniocentesis is the most common indications of pregnant women. In Denmark, the age limit of the mother is 35 at the time of the last menstruation. The purpose of this study is to analyze the incidence of chromosomal abnormalities in young, low-risk pregnant women. 6305 pregnant women, aged 25 to 34 years old, it is estimated that their fetus will not increase the risk of genetic diseases