A nurse is caring for a client who has type 1 diabetes mellitus. The nurse misread the client's morning fasting blood glucose level as 210 mg/dL instead of 120 mg/dL and administered the insulin dose appropriate for a reading over 200 mg/dL. Which of the following actions should the nurse identify as the priority?

A. Complete an incident report: Filing an incident report is required for documentation and quality improvement, but it is not the immediate priority. B. Check the client's blood glucose level: Assessing the client’s current blood glucose is the immediate safety action to determine whether hypoglycemia is present and to guide urgent treatment. C. Give the client 15 to 20 g of carbohydrate: Administering carbohydrate is appropriate if the client is hypoglycemic, but assessment must come first to confirm the need and the correct treatment. D. Notify the nurse manager: Informing leadership may be necessary after ensuring client safety, but it is secondary to assessing and treating the patient.