Integral to the Antenatal Diagnostic Center is the Obstetrical Ultrasound Unit, where routine and high-risk pregnancies are evaluated with special emphasis on suspected fetal abnormalities, including fetal echocardiography. The unit performs Level II ultrasound in all trimesters of pregnancy and for all guided procedures including amniocentesis, chorionic villus sampling (CVS), percutaneous umbilical blood sampling (PUBS), and fetal therapy such as shunt placement.