Chorionic villus sampling & Fetoscopy

Chorionic villus sampling (CVS) analyzes chorionic villus cells, which eventually become the placenta. The test detects genetic abnormalities; sampling is done early in pregnancy.
The advantage of CVS is that a doctor can diagnose a problem earlier in pregnancy. The test can be done at 9 to 11 weeks instead of 16 to 18 weeks, as with amniocentesis. Some women choose CVS so they can make a decision about their pregnancy earlier. If a woman decides to terminate a pregnancy, the procedure may carry fewer risks when performed earlier in the pregnancy.

How the Test Is Performed
An instrument is placed through the cervix or through the abdomen to remove a small piece of tissue from the placenta. The procedure carries a small risk of miscarriage; only someone who is experienced in doing the test should perform it.



FETOSCOPY
Because of advances in fiber optics, we are able to look at a fetus or placenta as early as 10 weeks into its development. Ultrasound cannot provide the same degree of detail. Fetoscopy enables the doctor to look through a fetoscope to detect even subtle abnormalities and problems.

How the Test Is Performed
The doctor makes a small incision in the mother's abdomen and places a scope similar to the one used in laparoscopy through the abdomen. The doctor uses the fetoscope to examine the fetus and placenta.

The test is specialized and is not done very often. It is usually recommended if you have given birth to a child with a birth defect that cannot be detected by any other test. If your doctor suggests fetoscopy to you, discuss it with him or her. The risk of miscarriage is 3 to 4%. Only someone experienced at it should do the procedure.