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nt12周3头臀多少正常
更新时间: 2020-11-04 00:00:00  

NT值与孕周关系密切,测量的孕周有严格的规定,在妊娠11-14周进行,14周后胎儿淋巴系统发育完全,胎儿颈项部积聚的液体迅速引流,超声不易观察到透明层。正常妊娠11-14周颈项透明层厚度随孕周略有上升,粗略简单估计方法是,凡测值小于2.5mm时判断为正常,凡测值大于2.5mm时诊断为颈项透明层增厚。头臀径为胎儿头与臀之间的距离,表示胎体纵轴平行测量最大的长轴,主要用于判定孕7-12周的胎龄.在6—13周之间,头臀径=估计孕龄(周)-6.5(cm).即5.5cm

关键词: nt12 多少 正常

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