A client treated for type 2 diabetes mellitus for eight years arrives to the clinic describing elevated blood glucose readings intermittently for the past two months. Which information requires further assessment by the nurse? Reference Range: Blood Urea Nitrogen (BUN) [10 to 20 mg/dL (3.6 to 7.1 mmol/L)] White Blood Cell (WBC) 15,000 to 10,000/mm3 (5 to 10 x 109/L)] Blood Glucose [74 to 106 mg/dL (4.1 to 5.9 mmol/L)] Potassium [3.5 to 5 mEq/L (3.5 to 5 mmol/L)]