What is the correction factor per 1 unit insulin according to the 1800-rule?

What is the correction factor per 1 unit insulin according to the 1800-rule?

• A. Correction factor per 1 unit insulin = 1500 ÷ TDD.
• B. Correction factor per 1 unit insulin = 1800 ÷ TDD (rapid-acting).
• C. Correction factor per 1 unit insulin = 500 ÷ TDD.
• D. Correction factor per 1 unit insulin = TDD ÷ 1800.

Answer: (B)

The correction factor (insulin sensitivity factor) is how much your blood glucose falls with 1 unit of insulin. The 1800-rule uses rapid-acting insulin and your total daily dose (TDD) to estimate this: ISF = 1800 ÷ TDD. So the amount per unit of insulin is 1800 divided by TDD. For example, with a TDD of 60 units, 1 unit lowers glucose by about 30 mg/dL (1800/60 = 30). This helps determine how many units to give to correct a high glucose level. The other numbers relate to different concepts (for instance, 1500 ÷ TDD is for regular insulin; 500 ÷ TDD is a carbohydrate coverage ratio).

The correction factor (insulin sensitivity factor) is how much your blood glucose falls with 1 unit of insulin. The 1800-rule uses rapid-acting insulin and your total daily dose (TDD) to estimate this: ISF = 1800 ÷ TDD. So the amount per unit of insulin is 1800 divided by TDD. For example, with a TDD of 60 units, 1 unit lowers glucose by about 30 mg/dL (1800/60 = 30). This helps determine how many units to give to correct a high glucose level. The other numbers relate to different concepts (for instance, 1500 ÷ TDD is for regular insulin; 500 ÷ TDD is a carbohydrate coverage ratio).