What is Down Syndrome?
Amniocentesis
This test involves removing a small amount of the amniotic fluid that surrounds the fetus. It is usually done between 15 and 20 weeks of pregnancy. First, an ultrasound picture locates the fetus and the fluid. Then a thin needle is inserted through the woman's abdomen to remove a small amount of the fluid from the uterus.
In the fluid are fetal cells. The chromosomes in these cells are examined for Down syndrome and other chromosomal defects. There is a small risk of miscarriage: generally less than 1:100.
The results are available in about two weeks. Amniocentesis is over 99% accurate in diagnosing Down syndrome and other chromosomal defects. Amniocentesis detects nearly all open neural tube defects.
The cost is about $1,000 to $1,500. The patient or her insurance is responsible for payment. The Expanded AFP Screening Program does not pay for amniocentesis unless authorized.