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At what week of pregnancy can a chorionic villi sampling be performed?
A chorionic villi sampling can be performed as early as week 10 of the pregnancy.
What advantage does chorionic villi sampling have over amniocentesis?
yes
What are the two methods of prenatal diagnosis?
Amniocentesis and chorionic villi sampling.
What is the purpose of a chorionic villi sampling?
The tissue can be tested for genetic defects.
How soon in the pregnancy is chorionic villi sampling performed?
The chorionic villus sampling is performed by 10 weeks of gestation. The pregnancy can be safely terminated by this time, if necessary. That is the advantage of the procedure.
What does chorionic villus sampling involve?
Chorionic villus sampling involves the removal of a small amount of tissue directly from the chorionic villi (minute vascular projections of the fetal chorion that combine with maternal uterine tissue to form the placenta).
How is the decision to perform prenatal surgery made?
Ultrasound, amniocentesis or chorionic villi sampling checks for chromosomal abnormalities in the fetus.
What is A process where a long thin tube is used to withdraw fetal cells from the fetal side of the placenta is?
It is called chorionic villi sampling.
What does Chorionic villi become?
Chorionic villi are of fetal origin and eventually form the placenta
What tests can confirm the presence of Tay-Sachs disease in a fetus?
Amniocentesis or chorionic villi sampling can be used to determine if the fetus has Tay-Sachs disease.
How are amniocentesis and chorionic villi sampling are used in genetic screening?
Amniocentesis involves taking a sample of the amniotic fluid and checking the fluid for fetal tissue, metabolites, and other markers that would indicate that there is a problem with fetal development. Fetal genetic testing can be performed on the fetal cells in the amniotic fluid. Chorionic villi sampling essentially involves collecting a specific part of the placenta for genetic analysis. Since the placenta is the same genotype as the fetus it is possible to make a genetic diagnosis of the fetus based on analyzing the placenta. Chorionic villi sampling is less invasive and therefore less likely to cause fetal distress.
Briefly describe how are amniocentesis and chorionic villi sampling are used in genetic screening?
Amniocentesis involves taking a sample of the amniotic fluid and checking the fluid for fetal tissue, metabolites, and other markers that would indicate that there is a problem with fetal development. Fetal genetic testing can be performed on the fetal cells in the amniotic fluid. Chorionic villi sampling essentially involves collecting a specific part of the placenta for genetic analysis. Since the placenta is the same genotype as the fetus it is possible to make a genetic diagnosis of the fetus based on analyzing the placenta. Chorionic villi sampling is less invasive and therefore less likely to cause fetal distress.
