title: Correlation between thromboplastic activity and lecithin/sphingomyelin ratio in amniotic fluid--preliminary report.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D001777:Blood Coagulation; D005260:Female; D005865:Gestational Age; D006801:Humans; D010713:Phosphatidylcholines / Q000032:analysis*; D011247:Pregnancy; D013109:Sphingomyelins / Q000032:analysis*
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins