Final answer:
The nurse should prepare the client for amniocentesis, which is a prenatal diagnostic test to analyze the fetal cells and DNA. It is commonly performed to detect chromosomal abnormalities, genetic conditions, and neural tube defects.
Step-by-step explanation:
The nurse should prepare the client for amniocentesis. Amniocentesis is a prenatal diagnostic test that involves withdrawing a small amount of amniotic fluid from the uterus to analyze the fetal cells and DNA. It is commonly performed to detect chromosomal abnormalities, genetic conditions, and neural tube defects.