A client who has type 2 diabetes mellitus takes metformin 500 mg PO daily for blood glucose control. The client has been NPO since midnight in preparation for general anesthesia and surgery. At 0700 the client's serum glucose level is 250 mg/dL (13.9 mmol/L). Which action should the nurse implement? Reference Range: Fasting Blood Glucose [74 to 106 mg/dL (4.1 to 5.9 mmol/L)]