title: Procedure for the determination of the lecithin-sphingomyelin (L-S) ratio in amniotic fluid, with a new detection reagent.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D002855:Chromatography, Thin Layer; D003720:Densitometry; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D007202:Indicators and Reagents; D008722:Methods; D010713:Phosphatidylcholines / Q000032:analysis*; D011247:Pregnancy; D013109:Sphingomyelins / Q000032:analysis*; D013997:Time Factors
chemical_list: D007202:Indicators and Reagents; D010713:Phosphatidylcholines; D013109:Sphingomyelins