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孕28周s d正常值多少

更新时间: 2020-11-04 00:00:00     

孕28周S/D正常值为2.5-5.0,而且在一般情况下,S/D值不会超过5.0。S/D为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。

关键词: 正常值 多少

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