Sbarra A J, Selvaraj R J, Cetrulo C L, Kennedy J L, Herschel M J, Knuppel R, Kappy K, Mitchell G W, Kelley E C, Paul B B, Louis F J
Am J Obstet Gynecol. 1978 Apr 1;130(7):788-90. doi: 10.1016/0002-9378(78)90009-1.
In this study, we have attempted to correlate optical density measurements of amniotic fluids with L/S ratios. We may conclude, with over a 98 per cent accuracy, that fluids having optical density readings of 0.15 and above, at 650 nm. will have an L/S ratio over 2.0. Fluids having optical density readings up to 0.05 will have L/S ratios of about 1.3. Finally, amniotic fluids having optical densities greater than 0.05 and less than 0.15 will have L/S ratios of approximately 1.5.
在本研究中，我们试图将羊水的光密度测量值与卵磷脂/鞘磷脂（L/S）比值相关联。我们可以得出结论，在650纳米波长下光密度读数为0.15及以上的羊水，其L/S比值超过2.0的准确率超过98%。光密度读数高达0.05的羊水，其L/S比值约为1.3。最后，光密度大于0.05且小于0.15的羊水，其L/S比值约为1.5。
