The NP is seeing a 60-year-old woman with a 10 year history of T2DM. Her current medications include oral metformin and an oral SGLT2-I, and states she is feeling well, without report of blurred vision, excessive thirst or polyuria.  She has not had any laboratory tests done in the past 6 months.  Which of the following represents the best choice of test to determine her overall glucose control?

A. Fasting plasma glucose
B. Serum creatinine/ e GFR (estimated glomerular filtration rate)
C. Hemoglobin A1c
D. Random blood glucose

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