Should an ultrasound scan be a routine in the obstetric patient?
D000013:Congenital Abnormalities / Q000175:diagnosis*; D005260:Female; D006801:Humans; D010923:Placenta Previa / Q000175:diagnosis; D011247:Pregnancy; D011272:Pregnancy, Multiple; D011296:Prenatal Diagnosis; D014463:Ultrasonography