# How do you calculate insulin for a patient?

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## What is the 500 rule for insulin?

Use the 500 Rule to estimate insulin-to-carb ratio: 500/TDD = number of carb grams covered by a unit of insulin. Example: 500/50=10; 1unit of insulin will cover about 10 grams of carbohydrate.

## How is insulin dosed?

Basal insulin – given as half of the total daily dose. Premeal insulin – half of the total daily dose divided into thirds and given before each meal.

Fasting blood sugar (mg/dl) average over 3 days Adjustment to basal insulin dose (units of insulin)
60 – 79 subtract 2 units
subtract 4 or more units

## How much insulin do you give a patient?

The right dose depends on your target blood sugar level, how many carbs you’re eating, and how active you are. You might start with four to six units of insulin. Your dose may go up two to three units every 3 days until you reach your blood sugar target.

## What is the rule of 1500?

For regular insulin, use the “1500 rule.” This tells you how much your blood sugar will drop for each unit of regular insulin. For example, if you take 30 units of regular insulin daily, divide 1500 by 30. This equals 50.

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## What is the 450 rule for insulin?

Alternatively, the insulin-to-carbohydrate ratio (ICR) may be determined by the “450 rule.” To determine the ICR, divide 450 by the child’s total daily dose of insulin (TDD). For example, for a child with a TDD of 36 units, the ICR would be 450/36 = 12.5, or 1 unit per 12 g of carbohydrate.

## How is basal insulin calculated?

Basal/background insulin dose:

Your total daily insulin dose (TDI) = 160 lbs ÷ 4 = 40 units.

## What is sliding scale insulin?

A sliding scale varies the dose of insulin based on blood glucose level. The higher your blood glucose the more insulin you take. The Sliding Scale method is more precise than fixed dose insulin in that it takes account of the fact that people’s blood glucose is not always in the normal range before meals.

## What is a unit of insulin in mL?

Insulin is measured in International Units (units); most insulin is U-100, which means that 100 units of insulin are equal to 1 mL.

## What is the rule of 1700?

Divide: 1700 by Total Daily Insulin. This is your Sensitivity Factor/Correction Factor. 1700/30 = 50. This Correction Factor means that 1 unit of insulin will lower blood glucose by approximately 50mg/dl.

## How is ISF diabetes calculated?

The 100 rule (1800 rule for mg/dl) has been used to find the insulin sensitivity factor (ISF), that is, how many mmol/l (or mg/dl) 1 unit of insulin lowers the blood glucose level. ISF equals 100 divided by TDD (1800 divided by TDD for mg/dl).

## How much will one unit of insulin lower blood sugar?

One unit of insulin should cause your blood sugar level to drop 30 to 50 mg per dL, but you may need more insulin to get the same effect.

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