Question

A 36-year-old woman requests prenatal diagnosis. She is healthy and excited about finally getting pregnant. She is interested in genetic counseling and asks about the advantages of chorionic villus sampling versus amniocentesis. Which of the following is true when chorionic villus sampling is compared to amniocentesis?

A. Reduced post-procedure loss rate
B. Performed earlier
C. More likely to obtain an adequate sample
D. Lower rate of procedure related birth defects
E. Performed in isoimmunized pregnancies

Answer 1

When comparing chorionic villus sampling (CVS) to amniocentesis in terms of advantages, CVS is performed earlier in pregnancy, more likely to obtain an adequate sample, and has a lower rate of procedure-related birth defects.

Step-by-step explanation:

When comparing chorionic villus sampling (CVS) to amniocentesis in terms of advantages, the following is true:

B. Performed earlier: CVS can be performed earlier in pregnancy than amniocentesis, usually around 10-13 weeks gestation, while amniocentesis is usually performed around 14-20 weeks gestation.

C. More likely to obtain an adequate sample: CVS is more likely to obtain an adequate sample for testing since it involves obtaining a sample of placental tissue, while amniocentesis involves obtaining a sample of amniotic fluid.

D. Lower rate of procedure-related birth defects: The rate of birth defects related to the procedure itself is lower with CVS compared to amniocentesis.