Final answer:
In observing a pregnant client's neck with CD of pregnancy, there would typically be no relevant clinical changes to note. Chorionic villus sampling is a procedure that doesn't manifest observable changes in the neck.
Step-by-step explanation:
When observing the neck of a client with a chorionic villus sampling (CD) during pregnancy, typical clinical observations are not focused on the neck area as CD refers to a prenatal testing procedure. However, common changes observed in pregnant clients, in general, may include: an increase in maternal blood volume by about 30 percent and a 50 percent increase in respiratory minute volume. These physiological changes do not typically manifest as visible changes in the neck. Additionally, during pregnancy, weight gain is primarily in the breasts and abdominal region, and skin changes such as stretch marks and increased melanin can occur, which also would not be seen in the neck area.