title: Effect of labour on the lecithin/sphingomyelin ratio in serial samples of amniotic fluid.
abstract: Serial samples of amniotic fluid were taken from 48 patients during labour. The lecithin/sphingomyelin (L/S) ratio was estimated and found to rise in 52 per cent, remain almost unchanged in 33 per cent and fall in 15 per cent. The rate of rise in the L/S ratio seemed inversely related to the length of labour.
mesh_terms: D000653:Amniotic Fluid / Q000378:metabolism*; D005260:Female; D006801:Humans; D007743:Labor, Obstetric; D010713:Phosphatidylcholines / Q000378:metabolism*; D011247:Pregnancy; D013107:Sphingolipids / Q000378:metabolism*
chemical_list: D010713:Phosphatidylcholines; D013107:Sphingolipids