A nurse is preparing to administer insulin lispro to a client who has type 1 diabetes mellitus. Which of the following actions should the nurse plan to take?

The correct answer is A: Inject insulin lispro 15 min before a meal. This is because insulin lispro is a rapid-acting insulin that should be administered within 15 minutes before a meal to control postprandial glucose levels effectively. Administering it before a meal ensures that the insulin peaks when the client's blood glucose levels rise after eating, thus preventing hyperglycemia. Monitoring for polyuria (choice B) is important but not specific to insulin lispro administration. Checking the expiration date (choice C) is necessary but not directly related to the administration process. Administering insulin without washing the syringe (choice D) is incorrect as proper hygiene is essential to prevent infections.