title: Comparison of four indexes to fetal pulmonary maturity.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D002855:Chromatography, Thin Layer; D003720:Densitometry; D005069:Evaluation Studies as Topic; D005260:Female; D005333:Fetus / Q000378:metabolism*; D005865:Gestational Age; D005994:Glycerophosphates / Q000378:metabolism; D006801:Humans; D008168:Lung / Q000196:embryology*; D008722:Methods; D010713:Phosphatidylcholines / Q000378:metabolism; D010743:Phospholipids / Q000378:metabolism; D011247:Pregnancy
chemical_list: D005994:Glycerophosphates; D010713:Phosphatidylcholines; D010743:Phospholipids