Final answer:
The nurse should notify the provider if the client has a respiratory rate of 10/min while receiving magnesium sulfate IV to treat preterm labor.
Step-by-step explanation:
When caring for a client who is receiving magnesium sulfate IV to treat preterm labor, the nurse should notify the provider of an adverse effect such as a respiratory rate of 10/min. This is because a low respiratory rate could indicate respiratory depression, which is a potential side effect of magnesium sulfate administration. It is important to monitor the client's respiratory status closely to ensure their safety.