本文201例单胎臀位在产前2周进行B型超声检查,为分娩方式提供多项参考指标.(1)臀位诊断准确率:B型超声诊断臀位与产时符合率达100%.(2)预测胎儿体重:B型超声预测体重与出生体重符合率为73.63%.(3)胎儿异常情况:201例中脐带先露17例,胎头过度仰伸1例.凡估计胎儿体重≥3400g、足先露、脐带先露或胎头过度仰伸者均行选择性剖宫产,使围产儿死亡率显著降低 In this paper, 201 cases of single-breech b-type ultrasound in the prenatal 2 weeks for the delivery of a number of reference indicators. (1) breech diagnosis accuracy: B ultrasound diagnosis of breech and birth coincidence rate of 100% . (2) Predict fetal body weight: The predictive value of B-mode ultrasound is 73.63% of birth weight. (3) Fetal abnormalities: In the 201 cases, umbilical cord was exposed in 17 cases and fetal head was over-stretched in 1 case. ≥ 3400g, before the first dew, umbilical cord exposed or fetal head over the stretch were selective cesarean section, perinatal mortality was significantly reduced