Insulin Dose Adjustment for Fasting Patients

Rationale for Dose Reduction

Basal insulin carries a moderate to high risk of hypoglycemia during periods of fasting, particularly in older adults, according to the American Diabetes Association 1, 2, 3
The American Diabetes Association recommends reducing basal insulin doses by 25-35% when patients are not well managed or will be fasting, to minimize hypoglycemia risk 1, 3
Older adults are at higher risk for hypoglycemia during fasting periods, making dose reduction particularly important, with a recommended dose reduction of 25-35% 4

A 25-35% reduction in basal insulin dose is recommended for patients who will be fasting, resulting in a new dose of approximately 19-22 units for a patient initially on 29 units of Lantus 1, 3, 4, 6

For longer-acting basal analogs like insulin glargine, the timing of administration can remain unchanged despite NPO status, as it provides a relatively constant basal level of circulating insulin 1, 3

The American Diabetes Association recommends monitoring blood glucose more frequently during the NPO period, particularly before meals and at bedtime, with a target blood glucose range of 100-180 mg/dL 5, 7
If hypoglycemia occurs despite the initial dose reduction, consider further reducing the dose by an additional 10%, according to the American Diabetes Association 5

Patient age increases hypoglycemia risk, warranting careful dose adjustment, with older adults requiring closer monitoring 4
Patient weight and body mass index may affect insulin sensitivity, with a BMI of 25 potentially affecting insulin dose 8