Insulin Dosing Guidelines

Introduction to Insulin Dosing

• The American Diabetes Association recommends an initial calculation of 1 unit of insulin for every 10-15 grams of carbohydrate consumed, with adjustments based on individual insulin sensitivity and time of day 1

Insulin Administration

• Morning doses often require higher insulin amounts (lower ratio) due to dawn phenomenon, as suggested by the American Diabetes Association 2
• A correction dose calculation of (blood glucose level - target level) ÷ correction factor can be used, for example, (250-125) ÷ 25 = 5 units, as recommended by the American Academy of Pediatrics 3
• A standard calculation of 1 unit of regular insulin per 10g carbohydrate can be added to TPN solution, as recommended by the American Diabetes Association 1
• Consider adding insulin directly to solution if more than 20 units of correctional insulin have been required in the past, as suggested by the American Diabetes Association 1

Insulin Dosing Considerations

• The correction factor is an individualized measure of how much 1 unit of insulin will decrease blood glucose, as stated by the American Diabetes Association 2
• Coordination between meal delivery and insulin administration is critical to prevent hypo/hyperglycemia, as emphasized by the American Diabetes Association 4
• Insulin stacking, which is administering correction doses too frequently without accounting for insulin already active, should be avoided, as warned by the American Diabetes Association 2
• Immediate adjustment of insulin is recommended when nutrition is interrupted, which may require a 10% dextrose infusion, as recommended by the American Diabetes Association 4

Ongoing Insulin Management

• The insulin-to-carbohydrate ratio should be regularly reassessed and adjusted based on blood glucose patterns, with special attention to hypoglycemic episodes, as recommended by the American Diabetes Association 4
• Carbohydrate counting for insulin requirements can be calculated using a ratio of 1 unit of insulin for every 10-15 grams of carbohydrate consumed, with adjustments based on individual patient factors, as recommended by the American Diabetes Association 4, 5, 6
• Consistent carbohydrate meal plans are preferred as they facilitate matching prandial insulin doses to carbohydrate intake, according to the American Diabetes Association 4
• For standard meals, insulin requirements can be calculated as 1 unit of insulin for every 10-15 grams of carbohydrate, with this ratio potentially varying throughout the day, often with higher insulin requirements in the morning, as noted by the British Journal of Anaesthesia 4, 5, 6, 2
• For patients on continuous tube feedings, total daily nutritional insulin can be calculated as 1 unit for every 10-15 grams of carbohydrate per day, representing 50-70% of the total daily insulin dose, as recommended by the American Diabetes Association 4, 5, 7
• For enteral bolus feedings, approximately 1 unit of regular human insulin or rapid-acting insulin can be administered per 10-15 grams of carbohydrate before each feeding, with correctional insulin added as needed, according to the American Diabetes Association 4, 5
• For parenteral nutrition, the starting dose is 1 unit of regular insulin for every 10 grams of dextrose, with consideration for adding insulin directly to the solution if more than 20 units of correctional insulin have been required in the past 24 hours, as recommended by the American Diabetes Association 5
• Patients on glucocorticoids often require higher insulin-to-carbohydrate ratios, and for morning steroid regimens, consider using NPH insulin to match the peak action of steroids, as recommended by the American Diabetes Association 5, 6

Special Considerations

• Orders should indicate that meal delivery and insulin administration must be coordinated to prevent hypo/hyperglycemia, and for "meals on demand" services, protocols must account for variable meal timing, as recommended by the American Diabetes Association 4, 6
• Monitor for hypoglycemia risk, particularly between midnight and 6:00 AM, and patients with previous hypoglycemic episodes are at higher risk for subsequent events, according to the American Diabetes Association 4, 5, 6
• If enteral nutrition is interrupted, start 10% dextrose infusion immediately to prevent hypoglycemia, as recommended by the American Diabetes Association 4
• Failing to adjust for interrupted nutrition can lead to hypoglycemia, and always having protocols for unplanned discontinuation of carbohydrate sources is crucial, as noted by Critical Care Medicine 8
• Overlooking diurnal variations in insulin requirements, which are often higher in the morning due to the dawn phenomenon, can lead to suboptimal glycemic control, according to the British Journal of Anaesthesia 2
• Not considering protein and fat in insulin dosing, as high protein/fat meals may require additional insulin adjustments for some patients, as recommended by the American Diabetes Association 9