Final answer:
In a prenatal care setting, teaching about chorionic villus sampling would include the fact that an ultrasound will be used for guidance during the procedure and that results are typically available in about a week.
Step-by-step explanation:
When teaching a pregnant woman about chorionic villus sampling (CVS), a nurse would include several important points. Firstly, it's important to know that ultrasound guidance is used during the CVS procedure to help collect a sample of the placental tissue; this is the correct aspect they would include (B) "You'll have an ultrasound first and then the test" to ensure accuracy and safety. The results of the CVS usually take some time to be processed, so the statement (A) "The results should be available in about a week" is also correct and should be included in the teaching. It's also crucial for the patient to understand post-procedure precautions; however, the idea of immediately resuming an exercise program is something that should be discussed with a healthcare provider based on the individual's condition and the results of the procedure, making (C) less relevant directly after the procedure. Lastly, although CVS is a diagnostic test for genetic abnormalities, it is not used for identifying spinal defects; thus, option (D) "This test is very helpful for identifying spinal defects" is incorrect and should not be included in the teaching.