Fetal lung maturity prediction by placental grade and biparietal diameter.
D005260:Female; D005325:Fetal Organ Maturity; D005865:Gestational Age; D006801:Humans; D008168:Lung / Q000196:embryology*; D010920:Placenta / Q000033:anatomy & histology*; D011247:Pregnancy; D011263:Pregnancy Trimester, Third; D014463:Ultrasonography