Hill C M, Harkes A, Donnai P, Ferguson A, Tindall V R
Br J Obstet Gynaecol. 1979 Oct;86(10):773-6. doi: 10.1111/j.1471-0528.1979.tb10692.x.
The lecithin/sphingomyelin (L/S) ratios and optical densities at 650 nm were determined for 158 samples of amniotic fluid obtained by amniocentesis. A further 24 samples collected by vaginal aspiration from patients with spontaneous rupture of the membranes were also analysed. The relation between the L/S ratio and the optical density suggests that the more rapidly obtainable optical density measurement could be used as a screening procedure for fetal pulmonary maturity. A valid estimate of maturity by optical density is not possible in amniotic fluid aspirated from the vagina.
对通过羊膜穿刺术获取的158份羊水样本测定了卵磷脂/鞘磷脂（L/S）比值及650nm处的光密度。还分析了另外24份通过阴道抽吸从胎膜自然破裂患者处采集的样本。L/S比值与光密度之间的关系表明，更快速可得的光密度测量可用作胎儿肺成熟度的筛查程序。从阴道抽吸的羊水中通过光密度有效估计成熟度是不可能的。
