Prior to administering pain medication to an adult postoperative client, what information should the practical nurse (PN) obtain? (Select all that apply.)

A. Height and weight of client prior to admission is not typically necessary prior to administering pain medication unless specific weight-based dosing is required for certain medications. B. Client's pain rating on a scale of 1 to 10 is crucial to assess the current level of pain and determine the appropriate medication and dosage to administer. C. Knowing when the client last received pain medication helps determine if it's appropriate to administer the next dose, based on the medication's duration of action. D. Understanding how well the previous dose relieved pain informs decisions about continuing with the same medication or adjusting the regimen. E. While relevant for understanding the client's pain management history, this information is less critical immediately prior to administering a single dose of pain medication.