title: Ultrasound in obstetrics.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis; D001835:Body Weight; D000013:Congenital Abnormalities / Q000175:diagnosis; D005260:Female; D005317:Fetal Growth Retardation / Q000175:diagnosis; D005328:Fetal Viability; D005333:Fetus / Q000033:anatomy & histology*; D005865:Gestational Age; D006801:Humans; D010920:Placenta / Q000033:anatomy & histology; D006831:Polyhydramnios / Q000175:diagnosis; D011247:Pregnancy; D011272:Pregnancy, Multiple; D014310:Triplets; D014427:Twins; D014463:Ultrasonography