title: The lecithin/sphingomyelin (L/S) ratio in twin pregnancies.
abstract: The lecithin/sphingomyelin (L/S) ratio has been estimated in the amniotic fluid from 20 patients with a twin pregnancy. The values in each pair of amniotic fluids were closely related. If amniotic fluid from one sac only is available, it is suggested that a ratio of 2-5:1 is taken as the lower limit to predict the functional lung maturity of both twins.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D001034:Apgar Score; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007746:Labor Presentation; D008168:Lung / Q000196:embryology*; D010713:Phosphatidylcholines / Q000032:analysis*; D011247:Pregnancy; D011272:Pregnancy, Multiple; D013109:Sphingomyelins / Q000032:analysis*; D014427:Twins
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins