According the medium-term and terminal obstetric gestation to taking ultrasonic inspection for the sake of screening fetus monstrosity,pregnant women who have high risk factors must take stated ultrasonic inspection from the twelfth week since fetation.

• 方法按产科中、晚期妊娠进行常规超声检查,筛查胎儿畸形,对具有高风险孕妇应从孕12w开始进行超声定期随访。