When the S/D value of UmA was more than 3,PI more than 1.7,and RI more than 0.8,fetal intrauterine hypoxia was suggested.

• 胎儿的脐动脉 (UMA)S/D值>3、PI值 >1 7、RI值 >0 8时 ,提示宫内缺氧。