Glycated hemoglobin testing alone is usually done without fasting and can be done on an empty stomach or after a meal. Glycated hemoglobin testing, unlike fasting blood sugar testing, can be done before or after a meal. This result is not affected by what you eat or drink. Glycated hemoglobin is primarily a test of a patient’s average blood sugar level over the last two to three months. The test can usually be performed every three to six months and helps in the diagnosis of diabetes and the adjustment of medications during diabetes treatment. When patients find abnormal glycosylated hemoglobin test results, they should go to the hospital in time for a clear diagnosis and under the guidance of the doctor for standardized treatment and regular review.