Why your doctor asks for HbA1c, what the numbers mean, and how quickly it can change.
Dr. Tanvi Joshi
HbA1c measures how much sugar has stuck to your red blood cells over the last two to three months. It is a better picture of control than a single sugar reading.
Below 5.7% is normal; 5.7 to 6.4% is prediabetes; 6.5% or above suggests diabetes. Most people with diabetes aim for under 7%.
Because red cells live about 120 days, a change in diet or medicines shows up fully in the HbA1c after about three months.
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