Determine fetal position, then scanned fetal face on coronal, sagittal and transverse planes, to diagnose cleft lip, or complicate d cleft palate.

• 首先确定胎位,然后对胎儿颜面部进行冠状、矢状及横切面扫查,利用相互垂直的三个正交切面发现并确诊胎儿唇腭裂。