A nurse is caring for a client who has a prescription for vancomycin 1 g IV intermittent infusion over 30 min every 12 hr. Which of the following actions should the nurse take?

The correct answer is C: Contact the provider for prescription clarification. This action is essential because the nurse needs to confirm the dose, frequency, and duration of vancomycin administration with the prescribing provider. Vancomycin dosing is often weight-based and adjusted based on renal function, so it is crucial to ensure accuracy to prevent medication errors and potential adverse effects. Requesting a serum trough level (choice A) is important to monitor vancomycin levels and prevent toxicity, but it is not the initial action to take. Changing the infusion site after each dose (choice B) is unnecessary unless there are complications at the current site. Requesting a serum peak level prior to infusion (choice D) is not typically done for vancomycin monitoring.