A 56-year-old male presents for a follow up visit in your of…
A 56-year-old male presents for a follow up visit in your office. He is a known diabetic and hypertensive for 6 years. He has no complaints today and is up-to-date in the management of his conditions. He is not allergic to any medications. His medications include metformin, hydrochlorothiazide, aspirin, and acetaminophen for occasional headaches. He had just read about renal complications of diabetes mellitus and he would like to know what test could be done to evaluate him for diabetic nephropathy. His laboratory values are shown in the table. Serum glucose 129 mg/dl Sodium 144mmol/L Potassium 5.0mmol/L Chloride 110mmol/L Bicarbonate 22mmol/L BUN 15mg/dL Creatinine 1.1mg/dL Hemoglobin A1C 8.9% Which of the following tests is the most appropriate intervention for this patient?