Surfactant phospholipids need not be extracted from amniotic fluid.
D000653:Amniotic Fluid / Q000032:analysis*; D002498:Centrifugation / Q000379:methods; D005260:Female; D006801:Humans; D011247:Pregnancy; D011663:Pulmonary Surfactants / Q000302:isolation & purification*
D011663:Pulmonary Surfactants