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孕30周sd值多少算正常范围
更新时间： 2020-11-05 00:00:00  

S/D值是胎儿脐动脉收缩压与舒张压的比值，观察S/D比值的动态变化，可判断胎盘的发育情况。正常情况下，随着胎儿的发育，胎盘逐渐增大，血管阻力逐渐减少，S/D比值也会逐渐的减小。一般到孕30周以后，S/D比值不超过3.0，如果超过3.0，说明胎儿血循环阻力较大，应考虑胎儿宫内缺氧的可能。建议在医生的指导下给予吸氧、左侧卧位等处理后，一般都会有所好转，可以不必担心，密切观察胎动情况即可，如有异常及时就医。

关键词： sd 多少 正常 范围

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