양수의 Optical Density와 L/S에 관한 연구

Abstract

The optical density differences at 450nm (.<lOD" o) , optical densities at 650nm, and lecithin/sphingomyelin ratios of amniotic fluid samples obtained from 63 normal pregnant women of various gestational periods were measured by spectrophotometric analysis and thin-layer chromatographic techniques. The values of .<lOD' a decreased continuously with the progression of pregnancy, and showed the possibility of being used as a test for gestational age or fetal maturity. The interrelation between optical densities at 650 nm and L/S ratios. as a fetal maturity test , was appraised. Optical density readings of O. 15 or greater correleated 100% with L/S ratios of 2.0 or greater Optical density readings below 0.15 correlated 83.7% with L/S ratios below 2.0 It was thought that a more simple test of optical density at 650nm than L/S ratio could be used as a test for fetal maturity. But further studies needed for confirmation.