Amniocentesis Versus Chorionic Villus Sampling
When there is a possibility of genetic abnormalities in a baby, it is sometimes best to perform testing on the baby before it is born. Certain types of issues will require special treatment when the baby is born or throughout the pregnancy. Because of this, there are different ways that genetic testing can be completed.
Amniocentesis and chorionic villus sampling are two ways that this testing can be completed. With amniocentesis, amniotic fluid is taken and sent to a lab for testing. This procedure is completed by inserting a thin needle into the amniotic sac, which doctors use an ultrasound machine to guide. The results take two to three weeks and the results are over 99% accurate.
With chorionic villus sampling, over 200 disorders are checked for. However, it is mostly used to test for Down Syndrome. This is completed if an abnormal first trimester screening occurs or if the parents are known to be carriers for a particular disorder.
With the chorionic villus, a small sample of tissue is taken from growths in the placenta. It is completed by placing a flexible tube into the vagina and cervix and into the placenta. Doctors can then use a needle to collect the sample. This test is completed between the 10th and 12th weeks of a pregnancy.
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