The lecithin/sphingomyelin ratio in cases associated with fetomaternal disease.
D000653:Amniotic Fluid / Q000032:analysis*; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis*; D006801:Humans; D010713:Phosphatidylcholines / Q000032:analysis*; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis; D011296:Prenatal Diagnosis; D013109:Sphingomyelins / Q000032:analysis*
D010713:Phosphatidylcholines; D013109:Sphingomyelins