Women over age 35 have an increased risk of having a baby with a chromosome abnormality, such as Down syndrome. The tests may also be useful if you have previously had a child with Down syndrome or another disorder, such as spina bifida. The test may also be helpful if you or your partner are known carriers of a genetic disorder, such as cystic fibrosis. Your body will make more fluid to replace the fluid that is taken out. The baby will not be hurt during the procedure.
Some women feel mild cramping during or after the procedure.
Your doctor may tell you to rest on the day of the test, but usually you can resume normal activity the next day. Local anesthesia is used for this test. The sample of placenta may be obtained through the cervix. A catheter is inserted into the vagina and through the cervix and the sample is withdrawn. The sample also can be obtained by inserting a needle into the abdomen and withdrawing some of the placenta.