Insulet Corporation 019 Manuale Utente

Duration of insulin action: 3 hours

Time since previous meal bolus: 2 hours

Previous meal bolus: 4.5 units
3 hours – 2 hours = 1 hour 

1 hours ÷ 3 hours = 1/3
1/3  4.5 units = 1.5 units meal insulin on board (IOB) 

In other words, two hours after your previous meal bolus, you 
have received 3 units of insulin from it; 1.5 units of insulin are still 
working to cover your meal.

The examples below use these settings:

•

Target BG: 100 mg/dL

•

IC ratio: 1:15

•

Correction factor (CF): 50

•

Duration of insulin action: 3 hrs

Current BG level: 150 mg/dL
Carb intake: 0 grams of carbohydrate (carbs)
Meal IOB: 1 unit
Correction IOB: 1 unit
Correction bolus: 150 mg/dL (current) – 100 mg/dL (target) = 50
50 ÷ 50 (CF) = 1 unit 
Meal bolus: 0 (carbs) ÷ 15 (IC ratio) = 0 units
Suggested bolus dose = 1 (correction) + 0 (meal) – 2 (meal + 
correction IOB) = 0 U

Current BG level: 150 mg/dL
Carb intake: 45 carbs
Meal IOB: 0 units
Correction IOB: 0 units
Correction bolus: 150 mg/dL (current) – 100 mg/dL (target) = 50
50 ÷ 50 (CF) = 1 unit
Meal bolus: 45 (carbs) ÷ 15 (IC ratio) = 3 units
Suggested bolus dose = 1 (correction) + 3 (meal) – 0 (IOB) = 4 U

Meal IOB is used only to reduce a correction bolus, 
and the correction bolus is only reduced until it 
becomes 0 units.