首次检查可以选在孕14周左右。怀孕几个月做四维彩超合适? 此期可在同一切面上显示胎儿头、体、四肢的胎儿整体图像,在四维实时检查过程中,可观察胎儿的整体活动是否协调,但此时胎儿面部显示效果欠佳,内脏亦显示不清晰。
第二次检查可于孕22周左右进行。此时胎儿较前期增大,在同一幅图像上不能显示胎儿的整体结构,但胎儿局部结构及运动状态较前清晰,可发现严重的胎儿畸形有:无脑儿、严重脑膨出、严重开放性脊柱裂、严重胸膜壁缺损并内脏外翻、单腔心、致死性软骨发育不良等。
第三次检查可于孕28周左右进行。此期胎儿皮下脂肪较以上饱满,面部表情也比较丰富,胎儿各个部位较前期更加清晰,不仅对以上各类畸形的诊断更加明确,而且胎儿面部的各种表情,如吃手指、喝羊水、打呵欠、哭闹等表情清晰可见。特别是胎儿的某些畸形有可能在中孕晚期或孕晚期才表现出来,所以孕晚期的超声检查是必不可少的。
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