论文部分内容阅读
了解胎儿在子宫内的生长发育是否符合妊娠周数,对妊娠期的正确处理具有重要的意义。估计妊娠周数的方法有多种,利用超声探测是一种较为准确的方法。妊娠13周前超声测量胎儿顶臀长度,和妊娠26周前测量胎头双顶径均比较准确。但亦有认为在27周后超声测量胎头双顶径的准确度则明显下降。最近,一些学者提出妊娠中期的前半段超声测量胎儿股骨长度可以更准确地推测妊娠周数,并认为在妊娠中期后股骨长度的探测仍然精确。
Understanding fetal growth and development in the womb is consistent with the number of weeks of pregnancy, the correct handling of pregnancy is of great significance. There are many ways to estimate the number of weeks of pregnancy, using ultrasound is a more accurate method. 13 weeks before pregnancy, fetal ultrasound measurement of the top hip length, and pregnancy measured 26 weeks before fetal head biparietal diameter are more accurate. However, it is also believed that the accuracy of ultrasound in measuring fetal biparietal diameter decreased significantly after 27 weeks. Recently, some scholars have proposed that ultrasound measurement of the fetal femur length in the first half of the second trimester of pregnancy can predict pregnancy weeks more accurately and that the detection of the femur length after the second trimester of pregnancy is still accurate.