Appendix
143
Example of meal insulin-on-board (IOB)
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 (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.
Examples of suggested bolus calculations
The examples below use these settings:
•
Target BG: 5.6 mmol/L
•
I/C ratio: 1:15
•
Correction factor (CF): 50
•
Duration of insulin action: 3 hrs
Example 1
Current BG level: 8.4 mmol/L
Carb intake: 0 grams of carbohydrate (carbs)
Meal (IOB): 1 units
Correction insulin on board (IOB): 1 units
Correction bolus: 8.4 mmol/L (current) – 5.6 mmol/L (target) = 50
50 ÷ 50 (CF) = 1 unit
Meal bolus: 0 (carbs) ÷ 15 (IC ratio) = 0 units
Suggested bolus dose = 1 (correction) + 0 (meal)
–
2 (IOB) = 0U
Example 2
Current BG level: 8.4 mmol/L
Carb intake: 45 carbs
Meal (IOB): 0 units
Correction IOB: 0 units
Correction bolus: 8.4 mmol/L (current) – 5.6 mmol/L (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) = 4U
Meal (IOB) is only used to reduce a correction bolus,
and the correction bolus is only reduced until it
becomes 0 units.
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