The process involves determining an individual’s insulin sensitivity to lower elevated blood glucose levels back into a target range. It requires dividing a set number, most commonly 1500 or 1800, by the total daily dose of insulin. The result indicates how much one unit of rapid-acting insulin will decrease a person’s blood glucose level, measured in milligrams per deciliter (mg/dL). For example, if a person uses 50 units of insulin per day and uses the 1500 rule, the calculation would be 1500/50 = 30. This suggests that one unit of rapid-acting insulin will lower the person’s blood sugar by approximately 30 mg/dL.
This calculation is a key component of effective diabetes management, enabling individuals to adjust their insulin doses to address hyperglycemia proactively. It facilitates greater control over blood sugar fluctuations, potentially reducing the risk of both short-term complications, such as diabetic ketoacidosis, and long-term health problems associated with chronic high blood sugar. Historically, reliance on fixed insulin doses often led to suboptimal glycemic control. This approach allows for personalized adjustments based on individual responses to insulin, leading to improved outcomes.