近年来,由于传染性疾病和营养性疾病的发生率已降低,遗传性疾病的诊治和预防受到重视,其重要措施之一便是开展遗传咨询服务和先天性胎儿异常的产前诊断。因此,世界各地已先后建立了几百个产前诊断中心,而我国随着计划生育工作的 In recent years, as the incidence of infectious diseases and nutritional diseases has dropped, attention has been paid to the diagnosis, treatment and prevention of hereditary diseases. One of the important measures is to carry out genetic counseling services and prenatal diagnosis of congenital fetal abnormalities. Therefore, hundreds of prenatal diagnostic centers have been set up all over the world, and with the work of family planning in our country