近十年来,我们已经看到了妇产科临床实践中有了飞速的发展,具体地说,现在可以利用产前诊断的技术了解到孕妇在孕期内胎儿的情况。如果产前诊断证实胎儿是异常的,即可中止妊娠。现在对那些可能会给胎儿带来严重的遗传性疾病的孕妇进行产前诊断已被列为常规。图1表示在瑞典1972～1978年每年所做的产前诊断的数目,每年的例数呈指数性增加。 In the past ten years, we have seen rapid development in the clinical practice of obstetrics and gynecology. Specifically, we can now use the technology of prenatal diagnosis to understand the situation of pregnant women during pregnancy. If the prenatal diagnosis confirmed that the fetus is abnormal, you can terminate the pregnancy. Prenatal diagnosis of pregnant women who may cause severe genetic disease to the fetus has now become routine. Figure 1 shows the annual number of prenatal diagnoses done in Sweden from 1972 to 1978, with an exponential increase in the number of cases per year.