A woman who is at 12 weeks' gestation asks the nurse if she can undergo chorionic villus sampling (CVS) testing in order to determine whether her baby has a neural tube defect. Which response is best?
1. "No, because CVS testing is not performed until after 20 weeks' gestation."
2. "No, because CVS testing alone at any stage cannot detect neural tube defects."
3. "Yes, at 12 weeks' gestation, CVS can be used to diagnose a neural tube defect."
4. "Yes, at 12 weeks' gestation, CVS is combined with amniocentesis to diagnose neural tube defects."
2
Explanation:
1. While CVS is typically performed between 10 and 13 weeks' gestation, this test cannot detect neural tube defects.
2. Because CVS testing is performed so early in the pregnancy, it cannot detect neural tube defects.
3. CVS is typically performed between 10 and 13 weeks' gestation; however, CVS does not detect neural tube defects.
4. CVS is typically performed between 10 and 13 weeks' gestation; however, amniocentesis is not performed until 15 weeks' gestation.
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