Final answer:
To determine a client's identity prior to medication administration, the nurse should ask the client his name and cross-reference the MAR with the client's medical record.
Step-by-step explanation:
In order to determine a client's identity prior to medication administration, the nurse should ask the client his name. This helps to verify that the file folder in the nurse's hands is the correct one and also ensures that the client is aware, oriented, and capable of interacting. Additionally, the nurse can cross-reference the MAR (Medication Administration Record) with the client's medical record to confirm the identity and prescribed medication.