The HbA1c, the abbreviation for glycated or glycosylated hemoglobin, is a biological value used in the monitoring of diabetes. A form of hemoglobin, hemoglobin A circulating in the blood, normally regulates a portion of the blood glucose. Because the blood sugar level is too high in a diabetic patient, this regulation is even more critical. The interest of the HbA1c level is the fact that this value better reflects the balance of the diabetic, by assessing, not a spot rate, but the average blood glucose level over the past 2 to 3 months. This dosage is carried out every three months and, depending on the results, the treatment is adapted to prevent the onset of diabetic complications, whose frequency of occurrence is correlated with HbA1c.