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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