Hemoglobin A1c with Calculated Mean Plasma Glucose (MPG) - The American Diabetes Association (ADA) suggests getting this test twice a year if your blood sugar is stable, and every three months if it's not well controlled. The test also includes a calculation of the Mean Plasma Glucose (MPG), which estimates the average blood glucose level derived from the HbA1c result. This calculated MPG helps in understanding daily glucose fluctuations and tailoring diabetes management plans accordingly. High levels indicate poor blood sugar control, suggesting a need for adjustments in treatment.