This<unk>  is conducted between 18 to 22 weeks' gestation, but most often performed at 19 weeks, as a component of routine prenatal care. Prior to 18 weeks' gestation, the fetal organs may be of insufficient size and development to allow for ultrasound evaluation.<unk> s performed beyond 22 weeks' gestation may limit the ability to seek pregnancy termination, depending on local legislation. Two-dimensional (2D) is used to evaluate fetal structures, placenta, and amniotic fluid volume. Maternal pelvic organs are also evaluated. Views are obtained using an abdominal ultrasound probe, but a vaginal ultrasound probe may also be used to evaluate for placenta previa and cervical length. Three-dimensional (3D) ultrasound is not recommended for routine use during<unk> , but 3D ultrasound may be utilized to further evaluate suspected abnormalities in specific fetal features.
Anomaly scan
Milan criteria
Partogram
EConsult
Triple test score
ABCD rating
EXIT procedure
Milch classification