Haemoglobin, the oxygen-carrying protein found in red blood cells, binds to glucose in the blood and becomes ‘glycated’, forming a substance known as HbA1c.
Measuring glycated haemoglobin (HbA1c) represents the average blood glucose level over an extended period of time (usually 2-3 months) and is a measure of glucose control. Having a high HbA1c increases the risk or likelihood of developing diabetes-related complications.