<prompt> HbA1c level in blood explains -Acute rise of sugarLong terms status of blood sugarHepatorenal syndromeChronic pancreatitis  <response>: Measurement of glycated hemoglobin 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 hemoglobin; this alteration reflects the glycemic history over the previous 2-3 months, because erythrocytes have an average life span of 120 days. A rise of 1 in HbA1c corresponds to an approx average increase of 2 mmolL 36 mgdL in blood glucose. Reference : page 2410 Harrisons Principles of Internal Medicine 19th edition and page 808 Davidsons Principles and practice of Medicine 22nd edition 