A nurse is caring for a client who is scheduled for chorionic villus sampling (CVS).
Which of the following statements by the client indicates an understanding of the procedure?
“I will have a needle inserted through my cervix to obtain a sample of placental tissue.”.
. “I will have a needle inserted through my abdomen and uterus to obtain a sample of placental tissue.”.
“I will have a catheter inserted through my cervix and suctioning will be used to obtain a sample of placental tissue.”.
. “I will have a catheter inserted through my abdomen and suctioning will be used to obtain a sample of placental tissue.”.
The Correct Answer is C
This is because chorionic villus sampling (CVS) is a prenatal test that involves taking a sample of tissue from the placenta to test for chromosomal abnormalities and certain other genetic problems. There are two types of CVS procedures: transcervical and transabdominal. In the transcervical procedure, a catheter is inserted through the cervix into the placenta to obtain the tissue sample. In the transabdominal procedure, a needle is inserted through the abdomen and uterus into the placenta to obtain the tissue sample.
Choice A is wrong because it describes the transabdominal procedure, not the transcervical one.
Choice B is wrong because it describes the transabdominal procedure, but with a catheter instead of a needle.
Choice D is wrong because it describes the transcervical procedure, but with a needle instead of a catheter.
The normal ranges for CVS are between 10 and 12+6 weeks of gestation. 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 neural tube defects.
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Related Questions
Correct Answer is A
Explanation
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.
Correct Answer is B
Explanation
The correct answer is choice B. Results are usually available within 24 hours.This is known as the rapid CVS result.A more detailed set of CVS results will be available within 10 to 14 days, but may take up to 3 weeks in some cases.
Choice A is wrong because results are not usually available within 10 to 14 days.
This is the time frame for the final result, not the preliminary one.
Choice C is wrong because results are not usually available within 7 days.
This is too long for the rapid result and too short for the final result.
Choice D is wrong because results are not usually available within 30 days.
This is much longer than the usual time frame for both the rapid and the final result.
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