title: Effects of blood or meconium on the determination of the amniotic fluid lecithin/sphingomyelin ratio.
abstract: Increasing quantities of maternal and fetal serum were added to amniotic fluids with orignal high or low lecithin/sphingomyelin (L/S) ratios. It was found that serum contains an L/S ratio of approximately 1.31 to 1.46 and therefore its addition lowered high L/S ratios and raised low L/S ratios. The addition of meconium to amniotic fluid decreased the L/S ratio.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D001769:Blood; D005260:Female; D006801:Humans; D008470:Meconium; D010713:Phosphatidylcholines / Q000032:analysis* / Q000097:blood; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000592:standards; D013109:Sphingomyelins / Q000032:analysis* / Q000097:blood
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins