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胎儿b超误差为什么有时候有一斤多？

发布日期：2024-08-29 03:25:33编辑：胖虎爱撩妹

导读：孕妈们的B超产检报告上都会标明自己的胎宝宝大致的体重，有时候孕妈们会看到自己胎儿的体重吓一跳。然而，当孕妈们真正把孩子生下来之后上称一称就会发现，宝宝的实际体重和当初B超检查时的体重有一定的相差距离。
 
 
前段时间，小编的一位朋友生完孩子，就发现自己宝宝的体重和自己的产检报告上的体重相差了300多克。而听说有的妈妈就更为离谱，直接差了一斤多，但也有不少妈妈表示体重相差没多少。
 
妈妈们都以为B超的检查就是精准的数据，但没想到会有这么大的相差值。那么在胎儿的B超检查中，体重的误差为什么有时候相差甚微，而有时候却有一斤多呢？
 
 
 
一、B超本身就存在仪器测量误差
 
当我们仔细留意我们的产检报告当上面的结果时候，会看到体重背后会有一个“±401g”的误差标准，也就是说仪器检查的数据本身就会存在着将近一斤左右的误差浮动。并且，B超检查对于胎儿体重的测量本身就是一个大致估算结果，并非直接获取胎儿的体重。
 
B超的过程中，能够测量出胎儿身体的双顶径、股骨长、肱骨长等的各个数据，而仪器就能够通过胎儿的这些身体数据，利用一定的复合计算公式计算出胎儿的间接体重。因此，每一个身体数据的测量，都会成为胎儿体重浮动的变量。
 
 
 
二、胎儿发育的月龄影响
 
B超检查这件事情，其实是胎儿越小的时候，检查的数据就越准确的，因为胎儿小的时候，B超能够更加全面地对胎儿的身体数据进行扫描和计算，胎儿身体的各个部位也能够清晰准确地展示出来。而当胎儿发育的孕晚期，胎儿体积变大，测量的误差也会随之变大。
 
这是因为，孕晚期的时候胎儿的体积变大，B超的时候已经不能够全面观测到胎儿的身体，每一个视角都只能看到胎儿的局部，因此在数据测量拼接上，就会出现更多的误差因素。在这样的情况之下，胎儿体重的误差范围就更大了。
 
 
 
三、胎儿体位影响
 
毕竟B超的体重测算是需要通过胎儿身体的各个长度数据来进行公式计算的，所以胎儿的体位状态对于仪器的精准数据获取就有一定的影响作用。
 
一般情况下，如果胎儿在做B超的时候如果身体的动作是比较舒展的，那么B超在获取胎儿身体数据的时候就会比较准确，也更有利于计算出更为精准的胎儿体重。
 
但是，如果B超的时候胎儿的动作是蜷缩在一起的，那么身体的长度数据就会有所折叠，那么在胎儿体重的计算上数据值就更加的不精准一些。
 
 
 
四、腹壁厚度及羊水的影响
 
最后，不管是胎儿的成像图也好，还是胎儿的各种身体测量数据也好，都是B超通过声波的折射情况来间接获得的数据。除了上面说到的几种影响情况以外，孕妈肚子的厚度以及子宫内的羊水质量也会对声波数据的探测起到一定的阻隔和影响。
 
因为声波遇到物质的时候都会有所折射和损耗，因此妈妈的腹壁脂肪太厚以及羊水太多、太浑浊都会削弱声波的具体折射量，导致声波数据测量更为模糊，从而影响到数据收获的准确度。
 
 
 
重要提示：孕妈的B超测量出来的胎儿体重和实际胎儿体重是存在一定误差的，这主要是由于仪器本身就存在着测量的误差，而影响这些误差的因素大致有胎儿发育月龄的影响，体积越大测量误差愈大，胎儿的姿势以及孕妈腹壁的厚度、羊水的影响。
 
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