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sd值多少是正常的
更新时间： 2020-11-05 00:00:00  

sd值小于3是正常的，一般情况下，S/D值≥3.0认为是异常情况，提示胎盘循环阻力大，胎盘血流灌注量下降，使胎儿处于营养缺乏和缺氧状态。S/D，指胎儿脐动脉收缩压与舒张压的比值。与胎儿供血相关，当胎盘功能不良或脐带异常时此比值会出现异常，在正常妊娠情况下，随孕周增加胎儿需要增加S下降，D升高，使比值下降，近足月妊娠时S/D小于3。

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