title: Factors influencing the measurement of the lecithin sphingomyelin ration in amniotic fluid.
mesh_terms: D000096:Acetone / Q000494:pharmacology; D000653:Amniotic Fluid / Q000032:analysis*; D001202:Ascitic Fluid; D001769:Blood; D002498:Centrifugation; D002855:Chromatography, Thin Layer; D003720:Densitometry; D005260:Female; D005374:Filtration; D005865:Gestational Age; D006400:Hematocrit; D006801:Humans; D008470:Meconium; D008722:Methods; D010713:Phosphatidylcholines / Q000032:analysis*; D010743:Phospholipids / Q000302:isolation & purification; D011247:Pregnancy; D013109:Sphingomyelins / Q000032:analysis*; D013501:Surface-Active Agents / Q000302:isolation & purification
chemical_list: D010713:Phosphatidylcholines; D010743:Phospholipids; D013109:Sphingomyelins; D013501:Surface-Active Agents; D000096:Acetone