孕期做超声查抄都有目标,好比在早孕期即6-8周,重要看是不是宫内孕、宫外孕,是不是為活胎;12周時做超声是查抄胎儿颈後透明层,至關于小的筛畸;22周摆布做超声的目标是排畸查抄,看胎儿是不是存在心脏和頭颅等器官畸形。後期主如果弥补筛畸,由于有的畸形到晚期才呈現,邻近临蓐時主如果看有没有羊水的变革,另有脐带的問题。每次 B 超都有目标,且每次目标分歧,查抄成果也分歧。
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