Because some of the glucose in the bloodstream attaches to some of the hemoglobin and stays attached during the 120-day lifespan of red blood cells, glycosylated hemoglobin levels provide information about blood glucose levels during the previous 3 months. Fasting blood glucose and urine glucose levels only give information about glucose levels at the point in time when they were obtained. Serum fructosamine levels provide information about blood glucose control over the past 2 to 3 weeks.
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