title: Lecithin/sphingomyelin ratio in amniotic fluid obtained vaginally.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D005260:Female; D005322:Premature Rupture of Fetal Membranes / Q000150:complications; D006801:Humans; D007231:Infant, Newborn; D010713:Phosphatidylcholines / Q000032:analysis*; D011247:Pregnancy; D012127:Respiratory Distress Syndrome, Newborn / Q000209:etiology; D013109:Sphingomyelins / Q000032:analysis*
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins