Indications for ultrasonography in obstetrics.
D000013:Congenital Abnormalities / Q000175:diagnosis; D005260:Female; D005313:Fetal Death / Q000175:diagnosis; D005317:Fetal Growth Retardation / Q000175:diagnosis; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D007236:Infant, Small for Gestational Age; D010923:Placenta Previa / Q000175:diagnosis; D011247:Pregnancy; D011263:Pregnancy Trimester, Third; D011272:Pregnancy, Multiple; D014463:Ultrasonography