A nurse is teaching a client who is at 38 weeks of gestation about a contraction stress test. Which of the following statements should the nurse include in the teaching?

Rationale: A. "You will receive a dose of misoprostol to initiate contractions.": Misoprostol is used for cervical ripening and induction of labor, not for a contraction stress test. A CST uses nipple stimulation or low-dose oxytocin to produce mild contractions. Using misoprostol would create strong, prolonged contractions that could endanger the fetus. B. "I will apply an external fetal heart rate monitor during the test.": A contraction stress test evaluates how the fetal heart rate responds to contractions. External fetal monitoring is required to record the fetal heart pattern and contraction frequency, allowing the provider to assess for late decelerations that indicate uteroplacental insufficiency. This reflects accurate and essential teaching for the procedure. C. "I will give you a terbutaline injection after the test.": Terbutaline is a tocolytic used to stop contractions, but it is not routinely administered after a CST. The contractions produced during a CST are mild and temporary, and terbutaline is only given if excessive contractions occur, which is not expected in normal testing. D. "I will apply an oxygen face mask during the test.": Oxygen is not routinely administered during a CST because the goal is to observe how the fetus tolerates normal physiologic contractions. Oxygen is used only if fetal distress occurs, so including it in routine teaching suggests an incorrect understanding of the procedure.