title: Amniotic fluid and fetal maturity.
abstract: The lecithin/sphingomyelin ratio in amniotic fluid is a method of predicting fetal lung maturity. The L/H ratios in certain high risk pregnancies are poorly correlated with the shake test. The L/S ratios in drug addiction methadone pregnancies and diabetic pregnancies do not have a high degree of correlation with normal L/S ratios after 36 weeks of gestation and are often low.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D005260:Female; D006801:Humans; D008168:Lung / Q000196:embryology; D008691:Methadone / Q000494:pharmacology; D010713:Phosphatidylcholines / Q000032:analysis*; D011247:Pregnancy; D011663:Pulmonary Surfactants / Q000032:analysis; D013109:Sphingomyelins / Q000032:analysis*; D019966:Substance-Related Disorders / Q000378:metabolism
chemical_list: D010713:Phosphatidylcholines; D011663:Pulmonary Surfactants; D013109:Sphingomyelins; D008691:Methadone