title: Clinical experience with the amniotic fluid lecithin-sphingomyelin ratio. II. The L-S ratio in "stressed pregnancies".
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D005314:Embryonic and Fetal Development; D004964:Estriol / Q000652:urine; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis*; D005865:Gestational Age; D006801:Humans; D008168:Lung / Q000196:embryology*; D010121:Oxytocin; D010713:Phosphatidylcholines / Q000032:analysis*; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis / Q000652:urine; D013109:Sphingomyelins / Q000032:analysis*
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins; D010121:Oxytocin; D004964:Estriol