Lecithin/sphingomyelin ratio and the presence of phosphatidylglycerol.
D000653:Amniotic Fluid / Q000032:analysis*; D005260:Female; D006801:Humans; D010713:Phosphatidylcholines / Q000032:analysis*; D010715:Phosphatidylglycerols / Q000032:analysis*; D011247:Pregnancy; D011254:Pregnancy in Diabetics / Q000378:metabolism; D013109:Sphingomyelins / Q000032:analysis*
D010713:Phosphatidylcholines; D010715:Phosphatidylglycerols; D013109:Sphingomyelins