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■ Suggested Bolus Calculator Examples
A suggested bolus is equal to:
correction bolus + meal bolus – insulin on board.
Examples of each of these elements are shown below.
Example of correction bolus
Target BG: 100 mg/dL
Current BG: 200 mg/dL
Correction factor (CF): 50
200 mg/dL (current) –100 mg/dL (target) = 100 mg/dL
100 mg/dL ÷ 50 (CF) = 2 units correction bolus
If the reverse correction feature is turned On and if your current
BG is below your target BG, the suggested bolus calculator sub-
tracts a correction amount from the meal bolus.
Example of reverse correction bolus:
Target BG: 100 mg/dL
Current BG: 75 mg/dL
Correction factor (CF): 50
75 mg/dL (current) – 100 mg/dL (target) = –25 mg/dL
–25 mg/dL ÷ 50 CF = –0.5 units reverse correction bolus
(subtracted from meal bolus)
Meal bolus calculation
Carbs entered ÷ insulin-to-carb (I/C) ratio
Example of meal bolus
Carbs entered: 45 grams of carb
Insulin-to-carb ratio: 15
45 carbs ÷ 15 I/C ratio = 3 units meal bolus
Insulin-on-board calculation
(Duration of insulin action – time since your previous correction
bolus) ÷ (duration of insulin action) ∗ (previous correction bolus)
Example of insulin on board
Duration of insulin action: 3 hours
Time since previous correction bolus: 1 hour
Previous correction bolus: 3 units
3 hours – 1 hour = 2 hours
2 hours ÷ 3 hours = 2/3
2/3 ∗ 3 units = 2 units IOB
In other words, one hour after your correction bolus, you have
received only 1 unit of insulin from your previous correction
bolus; 2 units of insulin are still working to correct your BG. This
feature prevents delivering too much insulin when correcting a
high BG.
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