title: The effect of blood on lecithin/sphingomyelin (L/S) ratio and rapid surfactant test.
mesh_terms: D000649:Amniocentesis; D000653:Amniotic Fluid / Q000032:analysis*; D001769:Blood; D005260:Female; D006801:Humans; D010713:Phosphatidylcholines / Q000032:analysis*; D011247:Pregnancy; D013109:Sphingomyelins / Q000032:analysis*; D013997:Time Factors
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins