title: Estimating fetal lung maturity: a comparison of L/S ratio, foam stability test, and fetogram.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D005260:Female; D005333:Fetus / Q000000981:diagnostic imaging* / Q000502:physiology*; D006801:Humans; D008168:Lung / Q000196:embryology*; D010713:Phosphatidylcholines / Q000032:analysis* / Q000378:metabolism; D011247:Pregnancy; D011859:Radiography; D013109:Sphingomyelins / Q000032:analysis* / Q000378:metabolism
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins