Calculating Long-Acting Insulin Needs for Patients on Sliding Scale with Uncontrolled Blood Sugar

Initial Dosing Calculation

The American Diabetes Association recommends initiating long-acting insulin at 0.1-0.2 units/kg/day for patients with uncontrolled hyperglycemia on sliding scale insulin, with individualized titration based on fasting blood glucose levels 1, 2
For insulin-naive patients, the American Association of Clinical Endocrinologists suggests starting basal insulin at 0.1-0.2 units/kg of body weight per day 2
A typical adult starting dose is often approximately 10 units 1
For patients with severe hyperglycemia, consider starting at the higher end of the range 1
Administer long-acting insulin once daily, preferably at the same time each day 3

For hospitalized patients on enteral/parenteral feeding with no prior basal insulin, consider 5 units NPH/detemir every 12 hours or 10 units glargine/degludec daily 3, 4
Calculate from total daily dose of sliding scale insulin if available 3
If sliding scale requirements exceed 20 units per day, this can guide initial basal insulin dosing 3
Continue sliding scale insulin for correction while titrating basal insulin 3

Target fasting glucose range is 90-150 mg/dL 5
If 50% of fasting glucose values are above target, increase dose by 2 units 5
If more than 2 fasting glucose values per week are less than 80 mg/dL, decrease dose by 2 units 5

Basal-bolus insulin regimen provides better glycemic control than sliding scale alone 3, 4
When transitioning, calculate total daily sliding scale insulin used over previous 24-48 hours 4
Allocate approximately 50% of this amount to basal insulin 2
Distribute the remaining 50% as prandial insulin before meals 2
Continue correction insulin as needed before meals 3

For older adults, consider starting at the lower end of the dosing range due to increased risk of hypoglycemia 5
For perioperative patients, reduce evening/pre-procedure basal insulin dose by 25% to reduce hypoglycemia risk 3
For patients with type 2 diabetes and obesity, consider weight-based dosing but be cautious of insulin resistance requiring higher doses 6

Monitor blood glucose at least daily when initiating or changing insulin doses 3
Evaluate for overbasalization and adjust accordingly 6
If basal insulin has been optimized but blood glucose remains uncontrolled, consider adding prandial insulin or GLP-1 receptor agonist 6