Hodek B, Klarić P
Jugosl Ginekol Perinatol. 1986 May-Aug;26(3-4):69-71.
In 228 pregnant women examined by ultrasound in the 30th to the 40th week of gestation, the first placental maturity degree was found in the 31.6 week, the second degree in the 35.8 week, and the third degree in the 38.2 week. In 60 women with on term pregnancy also amniocentesis was carried out and the lecithin-sphingomyelin ratio (L/S) was compared with the ultrasound finding. In 6 of these pregnant women the third degree of placental maturity was observed, their L/S ratio was not below 2, and in their newborns no respiratory distress syndrome developed. Ultrasound estimation of placental maturity is a useful method in pregnancies in which no other methods could be applied.
在228名妊娠30至40周接受超声检查的孕妇中，首次发现胎盘成熟度为I度的孕周是31.6周，II度是35.8周，III度是38.2周。对60名足月妊娠的妇女也进行了羊膜穿刺术，并将卵磷脂 - 鞘磷脂比值（L/S）与超声检查结果进行比较。在这些孕妇中有6例观察到胎盘成熟度为III度，她们的L/S比值不低于2，并且其新生儿未发生呼吸窘迫综合征。在无法应用其他方法的妊娠中，超声评估胎盘成熟度是一种有用的方法。
