Objective To study the cutoff value of amniotic fluid lamellar body counts in prediction of fetal lung maturity and observe the influence on LBC of antenatal corticosteroid therapy for fetal lung maturation.

• 目的研究羊水板层小体计数在预测胎儿肺成熟时的界值,同时探讨促胎肺成熟治疗对LBC的影响。