为什么怀孕超过25周了之后就不能做四维彩超了?
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怀孕25周的四维彩超不是检查的最佳时间,但也可以进行超声筛查。四维彩超是妊娠中期的检查,最佳时间为20~24周。怀孕25周时,只要医生能清楚地看到各个器官和组织的发育情况,包括四肢的发育情况,就可以做4D色彩暂停。
四维彩色多普勒超声是妊娠中期的检查,最佳时间为20~24周。这个时期胎儿的器官基本生长发育比较成熟,羊水比较丰富,胎位也容易发生变化。因此,胎儿器官的筛查比较全面,包括对胎儿头部、腹部、四肢、脊柱等部位的检查。四维彩色多普勒超声的目的是检查胎儿是否有先天畸形。如发现畸形,应引产终止妊娠,引产最佳时间为妊娠12~24周,最迟不超过28周。越早实施,对女性的伤害越小;否则,对女性的伤害更大,甚至会导致不孕。
在孕育期间,做四维是什么意思?
随着科学技术的不断发展,目前临床上对孕妇的体检可以选择使用四维彩色超声检查方法。四维彩色超声检查是目前超声检查中最重要的检查方法之一。它可以立体成像和直观地呈现胎儿面部的发育和子宫内的外观。它还可以将检查过程记录成光盘,孕妇可以通过光盘观看胎儿的发育和活动。孕妇最好在孕期做两次4D检查,了解胎儿的发育情况。第一次检查的最佳时间是在怀孕20到24周之间,第二个最佳时间是在怀孕30到32周之间。由于许多胎儿畸形在生长发育过程中不断表现出来,所以两次检查的重点是不同的。由身体、四肢的观察到面部、内脏的查看。
做四维彩超中有哪些准备工作?
四维彩超是孕妇在怀孕期间经常做的检查之一,也被称为“大排畸形”检查。做4D彩超有以下注意事项:
- (1)、做4D彩超的最佳时间是20~28周,因为这期间胎儿发育完成,胎儿体积小,羊水适中,胎儿活动量大,体表也比较丰满,有利于胎儿四维超声成像和胎儿畸形筛查,是畸形的最佳时期。
- (2)、做前一晚要好好休息,要保持在做检查时有充足的精力。
- (3)、检查时尽量避免宝宝休息的时间。因为如果宝宝在休息和不活动的情况下,在四维彩超检查时,有些部位是无法检测到的。
- (4)、4D彩色多普勒超声需要排空膀胱,无需憋尿,无需禁食。
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