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应用改良Ｔｓａｉ法测定５０例正常妊娠晚期及２１例临产妇女羊水中饱和卵磷脂（ＳＰＣ）的含量。结果：羊水中ＳＰＣ随孕周增加而增加，临产后增加更明显。提示：羊水ＳＰＣ测定是一种特异性、敏感性、准确性较高的方法，能在妊娠晚期预测新生儿呼吸窘迫综合征。
The content of saturated lecithin (SPC) in amniotic fluid of 50 normal pregnant women and 21 pregnant women was measured by modified Tsai method. Results: The SPC in amniotic fluid increased with gestational age, and the increase was more obvious after labor. Tip: amniotic fluid SPC assay is a specific, sensitive and accurate method to predict neonatal respiratory distress syndrome in late pregnancy.