title: The L/S ratio and shake test in normal and abnormal pregnancies.
mesh_terms: D000653:Amniotic Fluid / Q000378:metabolism*; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D008168:Lung / Q000196:embryology; D010713:Phosphatidylcholines / Q000378:metabolism*; D011247:Pregnancy; D011248:Pregnancy Complications / Q000378:metabolism*; D011296:Prenatal Diagnosis; D012127:Respiratory Distress Syndrome, Newborn / Q000175:diagnosis; D013109:Sphingomyelins / Q000378:metabolism*
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins