title: Amniotic fluid lecithin-sphingomyelin ratio as an index of fetal maturity.
mesh_terms: D000649:Amniocentesis; D000653:Amniotic Fluid / Q000032:analysis* / Q000166:cytology; D001663:Bilirubin / Q000032:analysis; D001724:Birth Weight; D002845:Chromatography; D003404:Creatinine / Q000032:analysis / Q000097:blood; D003936:Diagnosis, Computer-Assisted; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D008722:Methods; D010713:Phosphatidylcholines / Q000032:analysis*; D011247:Pregnancy; D012127:Respiratory Distress Syndrome, Newborn / Q000175:diagnosis* / Q000517:prevention & control; D013109:Sphingomyelins / Q000032:analysis*; D013194:Staining and Labeling
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins; D003404:Creatinine; D001663:Bilirubin