What HbA1c value confirms diabetes?

Study for the Medical Council of Canada Qualifying Examination (MCCQE) I. Engage with flashcards and multiple-choice questions with detailed feedback. Prepare confidently!

Multiple Choice

What HbA1c value confirms diabetes?

HbA1c reflects average blood glucose over roughly the past 2–3 months by measuring the percentage of glycated hemoglobin. A value of 6.5% or higher is the diagnostic threshold for diabetes. This cutoff is used because it correlates with chronic hyperglycemia and the risk of diabetes-related complications. In clinical practice, a diabetes diagnosis typically requires a second abnormal HbA1c on a separate day if there are no clear hyperglycemia symptoms; if classic symptoms are present with a casual glucose of 200 mg/dL or higher, diabetes can be diagnosed without a second HbA1c test. Values below 6.5% do not diagnose diabetes—5.7% indicates prediabetes, and 6.0% is not diagnostic.

HbA1c reflects average blood glucose over roughly the past 2–3 months by measuring the percentage of glycated hemoglobin. A value of 6.5% or higher is the diagnostic threshold for diabetes. This cutoff is used because it correlates with chronic hyperglycemia and the risk of diabetes-related complications. In clinical practice, a diabetes diagnosis typically requires a second abnormal HbA1c on a separate day if there are no clear hyperglycemia symptoms; if classic symptoms are present with a casual glucose of 200 mg/dL or higher, diabetes can be diagnosed without a second HbA1c test. Values below 6.5% do not diagnose diabetes—5.7% indicates prediabetes, and 6.0% is not diagnostic.

More practice questions