The insulin sensitivity factor, also known as the correction factor, represents the estimated decrease in blood glucose level achieved by one unit of rapid-acting insulin. It provides an individualized measure of how responsive a person’s blood glucose is to insulin. A common method for estimating it involves dividing a constant (typically 1500 or 1800) by the total daily dose of insulin. For example, if an individual uses 60 units of insulin per day, employing the 1500 rule would result in a factor of 25 (1500/60 = 25), implying that one unit of insulin will lower blood glucose by approximately 25 mg/dL.
This calculation serves as a critical tool in diabetes management, enabling individuals and healthcare providers to tailor insulin dosages for meals and to correct high blood glucose levels. Accurate determination supports improved glycemic control, reducing the risk of both hyperglycemia and hypoglycemia. Its application has evolved alongside advancements in diabetes care, contributing to more precise and personalized therapeutic strategies. Initially derived from empirical observations, the understanding and utilization of this factor have become integral to modern insulin therapy.