Genetic amniocentesis is generally performed when a woman is 15 weeks pregnant. Your doctor will recommend an amniocentesis if birth defects are found on the ultrasound or if you having the baby at an advanced maternal age. Amniotic fluid is what surrounds the baby in the womb, will be removed from the uterus for testing or treatment.
First, you will need to get an ultrasound so your doctor can determine where the pocket of amniotic fluid is located. Once it is located, a small sample of fluid is taken from a needle away from the baby, which is testing in a lab. The procedure is safe, with less than 1 out of 750 procedures resulting in the risk of miscarriage.