What is the normal reference range for glycosylated hemoglobin levels?

The normal reference range for glycosylated hemoglobin (HbA1c) levels is 4-5.9%. This measurement reflects average blood glucose levels over the previous two to three months, providing insight into how well blood sugar levels have been managed over time.

A level below 5.7% is generally considered normal, while levels between 5.7% and 6.4% indicate prediabetes, and anything 6.5% or higher confirms diabetes. Therefore, a value between 4% and 5.9% is indicative of good glycemic control in individuals without diabetes. Understanding these ranges is critical for monitoring and managing diabetes effectively, as maintaining an appropriate HbA1c level can reduce the risk of complications associated with the disease.