胎盘异常
The UmA S/ D in patients with umbilical cord coiling, breech presentation, preterm labor, oligoamnios or placental abnormality was higher than that in controls.
脐带绕颈组S/D值升高,臀位、早产、胎盘异常、羊水过少或粪染组S/D值均高于对照组。
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