Ultrasound and Amniocentesis

Obstetrical ultrasound can help your doctor determine:

• how far along you are in your pregnancy;
• if you are going to have more than one baby;
• if your baby has any major health problems and is growing properly; and
• the position of the placenta, which can affect whether or not a vaginal delivery is safe.

Amniocentesis is a simple procedure that involves withdrawing amniotic fluid from around the growing fetus through a slender needle. Your doctor may recommend amniocentesis for many reasons, including:

• if your baby is at risk for certain types of birth defects such as Down syndrome, spina bifida or anencephaly;
• to determine if the baby's lungs are mature enough for delivery;
• if you have an infection; or
• if there is maternal blood sensitization (usually Rh sensitization) to make sure the baby is developing normally.