Ultrasonics in the demonstration of fetal heart movements.
D000033:Abortion, Threatened / Q000175:diagnosis; D004452:Echocardiography; D005189:False Positive Reactions; D005260:Female; D005313:Fetal Death / Q000175:diagnosis; D005318:Fetal Heart; D005865:Gestational Age; D006470:Hemorrhage / Q000175:diagnosis; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis*; D014463:Ultrasonography