title: Modified method for estimating the phosphatidyl choline: sphingomyelin ratio in amniotic fluid, and its use in the assessment of fetal lung maturity.
mesh_terms: D000645:Ammonium Sulfate; D000653:Amniotic Fluid / Q000032:analysis*; D002855:Chromatography, Thin Layer; D003720:Densitometry; D005314:Embryonic and Fetal Development; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D008168:Lung / Q000196:embryology*; D008722:Methods; D010713:Phosphatidylcholines / Q000032:analysis*; D011247:Pregnancy; D012127:Respiratory Distress Syndrome, Newborn / Q000378:metabolism; D013109:Sphingomyelins / Q000032:analysis* / Q000378:metabolism
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins; D000645:Ammonium Sulfate