title: The use of amniotic fluid L/S ratio to assess fetal lung maturity; a summary of three years experience at the South Central Regional Perinatal Center, Madison.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D006801:Humans; D007231:Infant, Newborn; D008168:Lung / Q000196:embryology*; D010713:Phosphatidylcholines / Q000032:analysis*; D012127:Respiratory Distress Syndrome, Newborn / Q000209:etiology; D013109:Sphingomyelins / Q000032:analysis*
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins