The ultrasonography of placental grading, biparietal diameter (BPD) and amniotic fluid in 377 cases at late period of pregnancy are studied and evaluated.

• 通过377例妊娠晚期的胎盘分级、胎头双顶径(BPD)及羊水超声显像观测,对其预测胎儿成熟度的价值进行了研究。