Chorionic Villus Sampling (CVS)
Chorionic Villus Sampling (CVS) ( 5 Questions)
A nurse is caring for a client who is scheduled for chorionic villus sampling (CVS).
Which of the following statements should the nurse include in the teaching?
The procedure can detect chromosomal abnormalities such as Down syndrome. This is because CVS involves taking a sample of tissue from the placenta, which contains the same genetic material as the fetus. By analyzing the chromosomes in the tissue sample, CVS can identify conditions caused by missing or extra chromosomes, such as Down syndrome.
CVS cannot detect neural tube defects such as spina bifida. Neural tube defects are problems with the development of the brain and spinal cord that occur early in pregnancy. CVS does not provide information on neural tube defects, so women who undergo CVS also need a follow-up blood test between 16 to 18 weeks of their pregnancy to screen for these conditions.
CVS can only detect some genetic disorders such as cystic fibrosis, not all of them. Genetic disorders are caused by changes in the DNA sequence of a gene, which affect how the gene works. CVS can test for some genetic disorders that are inherited in a simple pattern, such as cystic fibrosis, sickle cell disease, thalassaemia and muscular dystrophy. However, CVS cannot test for all genetic disorders, especially those that are complex or rare.
CVS cannot detect neural tube defects such as anencephaly. Anencephaly is a severe condition where the baby is born without parts of the brain and skull. As mentioned above, CVS does not provide information on neural tube defects, so women who undergo CVS also need a follow-up blood test between 16 to 18 weeks of their pregnancy to screen for these conditions.
The procedure can detect chromosomal abnormalities such as Down syndrome. This is because CVS involves taking a sample of tissue from the placenta, which contains the same genetic material as the fetus. By analyzing the chromosomes in the tissue sample, CVS can identify conditions caused by missing or extra chromosomes, such as Down syndrome.
Choice B is wrong because CVS cannot detect neural tube defects such as spina bifida. Neural tube defects are problems with the development of the brain and spinal cord that occur early in pregnancy. CVS does not provide information on neural tube defects, so women who undergo CVS also need a follow-up blood test between 16 to 18 weeks of their pregnancy to screen for these conditions.
Choice C is wrong because CVS can only detect some genetic disorders such as cystic fibrosis, not all of them. Genetic disorders are caused by changes in the DNA sequence of a gene, which affect how the gene works. CVS can test for some genetic disorders that are inherited in a simple pattern, such as cystic fibrosis, sickle cell disease, thalassaemia and muscular dystrophy. However, CVS cannot test for all genetic disorders, especially those that are complex or rare.
Choice D is wrong because CVS cannot detect neural tube defects such as anencephaly. Anencephaly is a severe condition where the baby is born without parts of the brain and skull. As mentioned above, CVS does not provide information on neural tube defects, so women who undergo CVS also need a follow-up blood test between 16 to 18 weeks of their pregnancy to screen for these conditions.