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孕38周 sd值多少是正常
更新时间: 2020-11-05 00:00:00  

sd值38周是2.3加减0.3。正常妊娠时胎儿的S/D值随着妊娠时间推移呈降低趋势,尤其S/D值的变化是掌握胎儿发育是否正常的重要指标。S/D为胎儿脐动脉收缩压与舒张压的比值,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。S/D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。

关键词: sd 多少 正常

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