A lab test called a glycosylated haemoglobin (HbA1c) can determine how much sugar has been in your blood over the previous two to three months. As part of routine physical examinations it is used to identify prediabetes identify diabetes and assess the effectiveness of treatment. HbA1c levels below 5.7% are considered normal whereas those above 6.5% are a sign of diabetes. The risk of problems increases when HbA1c rises. To monitor their glucose levels and manage treatment choices diabetics should administer this test frequently. Medication a regimented exercise plan and a nutritious diet can all help lower the amount.