The HbA1c assay is the gold-standard measurement of chronic glycemia and measures the amount of glucose that binds to hemoglobin over a period of 3 months. The HbA1c Test is often prescribed as a must-do blood test for pre-diabetic, type 1 diabetic or type 2 diabetic or even non-diabetics.lso called the Glycated/ Glycosylated Hemoglobin A Protein test, the HbA1c test gives the level of blood glucose estimated over a period of time (ideally 3 months or 8-10 weeks), The correct format of HbA1c is HbA1c but for convenience it is mentioned as HbA1c.