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18周头臀长多少正常
更新时间: 2020-11-05 00:00:00  

孕18周:双顶径的平均值为4.25士0.53cm,腹围的平均值为12.41士l.89cm。

头臀长即胎儿双顶径,是指胎儿头部左右两侧之间最宽部位的长度,又称为“头部大横径”。又称BPD,医生常常用它来观察胎儿发育的情况,判断是否有头盆不称,顺利分娩。

关键词: 多少 正常

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