A nurse is teaching a client about how to use a patient-controlled analgesia (PCA) pump. Which of the following instructions should the nurse include in the teaching?

Rationale: A. Only the client should push the PCA button. Allowing others to administer doses increases the risk of oversedation and respiratory depression. B. The lock-out interval prevents multiple doses from being delivered in a short period, ensuring safe administration. C. Lock-out intervals vary (often 5–15 minutes) depending on the medication and provider order, not a fixed 30 minutes. D. The client should assess their pain using the pain scale and self-administer medication as needed within the safety parameters of the PCA pump.