“…3 Since 1955, laboratory methods were established to detect hemoglobin variants and "minor components" in human blood and were named HbA1a, HbA1b, and HbA1c, in order of their elution from a chromatography column. 4,5 Their relation to diabetes was appreciated much later when these minor hemoglobins were detected in diabetic patients 6,7 as well as in nondiabetic adults in a proportion of 1-4%. 8 Structural studies later established that the hemoglobin found in patients with diabetes was indeed identical to HbA1c.…”