How frequently should HbA1c be measured in a patient with well-controlled type 2 diabetes?

HbA1c (glycated hemoglobin) reflects average blood glucose control over the preceding 2–3 months, corresponding to the lifespan of red blood cells (~120 days). For patients with well-controlled diabetes (HbA1c at target), measurement every 3 months (quarterly) is the standard recommendation. For poorly controlled patients, more frequent monitoring may be needed. An HbA1c below 7% is typically the target for most diabetic patients. In dentistry, HbA1c values help assess the patient's level of glycemic control when planning treatment.