Placental localization by ultrasound.
D000037:Abruptio Placentae / Q000175:diagnosis; D000649:Amniocentesis; D005260:Female; D005865:Gestational Age; D006801:Humans; D008722:Methods; D010920:Placenta / Q000033:anatomy & histology* / Q000502:physiology; D010923:Placenta Previa / Q000175:diagnosis; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis; D014465:Ultrasonics; D014463:Ultrasonography