OmniPod 5 - Page 244

Understanding SmartBolus Calculator Calculations 18
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18 Understanding SmartBolus Calculator Calculations
Insulin on board (IOB) calculations
Duration of Insulin Action – time since previous bolus
x previous bolus
Duration of Insulin Action
IOB from a previous correction bolus is called a “correction IOB”.
IOB from a previous meal bolus is called a “m e a l I O B ”.
Correction IOB example
Duration of Insulin Action: 3 hours
Time since previous correction bolus: 1 hour
Previous correction bolus: 3 U
3 hours – 1 hour
x 3 U = 2 U correction IOB
3 hours
Final IOB shown to you:
2 U correction IOB + 1 U automatic adjustment = 3 U overall IOB
In other words, one hour aer your previous correction bolus, your body has
used up 1 unit from the correction bolus. e remaining 2 units of insulin
are still working in your body to lower glucose. Additionally, the system can
automatically adjust the correction IOB based on its estimate of your insulin
needs. In this example, the automatic adjustment added 1 unit for a total of
3 units working to lower your glucose.
Correction Meal IOB example
Duration of Insulin Action: 3 hours
Time since previous meal bolus: 2 hours
Previous meal bolus: 4.5 U
3 hours – 2 hours
x 4.5 U = 1.5 U meal IOB
3 hours
In other words, two hours aer your previous meal bolus, your body has used
up 3 units from the meal bolus. e remaining 1.5 units of insulin are still in
your body, working to cover your meal.