<prompt> The Hemoglobin A1c level indicates the patients level of glycemic control during the previous1-2 months2-3 months3-4 months4-5 months  <response>: Measurement of glycated haemoglobin HbA1c is the standard method for assessing long-term glycemic control. When plasma glucose is consistently elevated, there is an increase in nonenzymatic glycation of haemoglobin; this alteration reflects the glycemic history over the previous 2-3 months because erythrocytes have an average lifespan of 120 days The glycemic level in the preceding month contributes about 50 to the HbA1c value.Harrison 19the pg: 2410 