%0 Journal Article %T The acetone precipitation step is needed in determining the lecithin/ sphingomyelin (LS) ratio of amniotic fluid. %A Gebhardt, D, O %J Clinical Chemistry %V 29 %N 1 %P 214-214 %@ 0009-9147 %D 1983-01-01 %I American Association of Clinical Chemistry %~ DeepDyve