Routine real-time ultrasound in a low-risk obstetric population.
D000328:Adult; D005260:Female; D005323:Fetal Monitoring / Q000379:methods*; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis / Q000628:therapy; D014463:Ultrasonography