title: The lecithin-spingomyelin ratio: its utility in a clinical setting.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D006801:Humans; D007231:Infant, Newborn; D010713:Phosphatidylcholines / Q000032:analysis*; D012127:Respiratory Distress Syndrome, Newborn / Q000175:diagnosis*; D013109:Sphingomyelins / Q000032:analysis*
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins