The false negative rate was high for the extremity malformations (39.46%) and facial malformations (31.91%), especially the acrosclerodermas, simple cleft palates, and ear deformities.

• 各系统中， 骨骼肢体系统及颜面部畸形的漏诊较多， 漏诊率分别为 39.；46%25和31