Amniocentesis is a prenatal procedure that your doctor may recommend you have during pregnancy. The test checks for fetal abnormalities (birth defects) such as Down syndrome, cystic fibrosis or spina bifida. In most cases, the results are normal. Amniocentesis is performed between 16 and 20 weeks into the pregnancy.
The most common reason to have an amniocentesis performed is to determine whether a fetus has certain genetic disorders or a chromosomal abnormality, such as Down syndrome. Amniocentesis (or another procedure, called chorionic villus sampling (CVS)) can diagnose these problems in the womb.
Chorion biopsy is an invasive diagnostic method that is mainly employed during early pregnancy (embryonic period). Normally, chorial tissue is removed trans-vaginally using a biopsy needle and examined in the direct preparation or after short-term in-vitro cultivation.
Chorionic villus sampling (CVS) is a prenatal test that is used to detect birth defects, genetic diseases, and other problems during pregnancy. During the test, a small sample of cells (called chorionic villi) is taken from the placenta where it attaches to the wall of the uterus. Chorionic villi are tiny parts of the placenta that are formed from the fertilized egg, so they have the same genes as the baby. You may be offered CVS if you have certain risk factors for having a baby with a birth defect or genetic disease, so that problems can be found early in pregnancy.
Fetal Reduction is a procedure used to reduce the number of fetuses in a multiple pregnancy, usually to two. When a pregnancy involves three or more fetuses, the risks of miscarriage, stillbirth, and structural malformation increase with each additional fetus.
Fetal reduction refers to choosing to reducea fetus in a multiple pregnancy, to decrease the health risks to the mother in carrying and giving birth to more than one or two babies, and to also decrease the risk of complications to the remaining fetuses.
It is usually done between 11 to 14weeks of pregnancy. It could be done in combination with the first trimester screening. The procedure usually does not have any adverse effect on the surviving fetus.