Ultrasonography has become a very important diagnostic tool in obstetrics and is now used extensively to determine anatomic parameters, such as location of the placenta, fetal presentation and lie and biometric measurements of the fetus to date the gestation. It is also used to assess fetal growth and to diagnose congenital anomalies. In fact, the indications of ultrasound in obstetrics have become so numerous, information obtained so valuable that, ultrasonography equipment has moved from the radiology department to the labor room and obstetrician’s office.