Insulin Management Guidelines

Initial Insulin Dosing and Regimen Selection

The American Diabetes Association recommends starting with basal insulin at 10 units once daily or 0.1-0.2 units/kg body weight for patients with type 2 diabetes requiring insulin therapy, while continuing metformin unless contraindicated 1, 2
For type 1 diabetes, the total daily insulin requirement is 0.4-1.0 units/kg/day, with 0.5 units/kg/day typical for metabolically stable patients, split as approximately 50% basal insulin and 50% prandial insulin divided among three meals 3, 2
The American College of Endocrinology suggests that basal-bolus regimen is mandatory from the outset for type 1 diabetes, as basal insulin alone is insufficient 3, 2

The American Association of Clinical Endocrinologists recommends increasing basal insulin by 2-4 units every 3 days until fasting plasma glucose reaches 80-130 mg/dL 1, 2
If fasting glucose is 140-179 mg/dL, increase basal insulin by 2 units every 3 days, and if fasting glucose is ≥180 mg/dL, increase by 4 units every 3 days 2
If hypoglycemia occurs, reduce the dose by 10-20% immediately 1, 2

The Endocrine Society recommends adding prandial insulin when basal insulin exceeds 0.5 units/kg/day and approaches 1.0 units/kg/day, rather than continuing to escalate basal insulin alone 1, 2
Clinical signals of "overbasalization" include basal insulin dose >0.5 units/kg/day, bedtime-to-morning glucose differential ≥50 mg/dL, hypoglycemia episodes, and high glucose variability throughout the day 2
When initiating prandial insulin, start with 4 units of rapid-acting insulin before the largest meal, or use 10% of the current basal dose 1, 2

The National Kidney Foundation recommends that patients with impaired renal function require lower insulin doses with closer monitoring for hypoglycemia 1, 2
For patients with CKD Stage 5, reduce the total daily insulin dose by 50% for type 2 diabetes and by 35-40% for type 1 diabetes 2
High-risk patients, such as the elderly (>65 years) and those with renal failure or poor oral intake, should use lower starting doses of 0.1-0.25 units/kg/day 1, 2

The Academy of Nutrition and Dietetics recommends taking mealtime insulin before eating, with meals consumed at different times, and adjusting the dose if physical activity occurs within 1-2 hours of mealtime insulin injection 4
For premixed insulin plans, insulin doses must be taken at consistent times daily, and meals must be consumed at similar times daily 4

The American Diabetes Association recommends treating hypoglycemia immediately when blood glucose is <70 mg/dL with 15-20 grams of fast-acting carbohydrate 4, 1
Recheck blood glucose 15-20 minutes after treatment, and repeat treatment if hypoglycemia persists 4
For patients on α-glucosidase inhibitors, use monosaccharides (glucose tablets) as the drug prevents digestion of polysaccharides 4

The Society of Hospital Medicine recommends a scheduled basal-bolus insulin regimen for non-critically ill hospitalized patients, rather than sliding scale insulin alone 1
For initial dosing, use 0.3-0.5 units/kg/day total daily dose, with half as basal insulin, for insulin-naive or low-dose insulin patients at home 1, 2
For high-dose home insulin (≥0.6 units/kg/day), reduce the total daily dose by 20% to prevent hypoglycemia 1, 2

The American College of Sports Medicine recommends regular physical activity (≥150 minutes weekly of moderate-intensity exercise) to decrease insulin resistance and potentially reduce insulin requirements 2
Exercise sessions should be no more than 2 days apart to maintain insulin sensitivity, and the dose should be lowered if physical activity occurs within 1-2 hours of mealtime insulin injection 2, 4

The American Association of Clinical Endocrinologists recommends daily fasting blood glucose monitoring and reassessment every 3 days to adjust doses during active titration 1, 2
Once stable, reassess every 3-6 months to avoid therapeutic inertia, and continue A1C monitoring every 3-6 months 1, 2