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Understanding PDM and Pod Function 1212 Understanding PDM and Pod Function
Insulin on board (IOB)
Aer a bolus is delivered, the amount of insulin that is active in the body decreases
over several hours. e Bolus Calculator approximates this decrease in insulin by
calculating an “insulin on board” (IOB) value. e calculated IOB value decreases
over time and reaches zero at the time set by the Duration of Insulin Action value.
For example, if your Duration of Insulin Action is 4 hours and an 8 unit bolus
is given at 18:00, the IOB amount decreases steadily over time as shown in this
graph.
Types of IOB: meal IOB, correction IOB or both
A bolus, and the IOB from that bolus, can be entirely meal, entirely correction, or
both. e following graphs show how the IOB from a 4 U total bolus decreases
over time with a Duration of Insulin Action of 4 hours.
Entirely meal
A meal bolus is calculated when you are
eating a meal and your blood glucose is less
than your Correct Above value. e IOB
from this bolus is entirely meal IOB.
Entirely correction
A correction bolus is calculated when you
are not eating and your blood glucose is
above your Correct Above value. e IOB
from this bolus is entirely correction IOB.
Both meal and correction
When you are eating and your blood glucose
is above your Correct Above value, the total
bolus includes a meal bolus and a correction
23:0022:00
21:00
20:00
19:0018:0017:00
Take 8 U bolus at 18:00
Duration of Insulin Action set to 4 hrs
4 hrs after the bolus,
IOB has returned to zero
3 hrs after the bolus: IOB = 2 U
2 hrs after the bolus: IOB = 4 U
1 hr after the bolus: IOB = 6 U
0
2 U
4 U
6 U
8 U
IOB (U)
22:00
20:00
18:00
0
2 U
4 U
Meal IOB
IOB (U)
22:00
20:00
18:00
0
2 U
4 U
Correction IOB
IOB (U)
22:00
20:00
18:00
0
2 U
4 U
Correction IOB
Meal IOB
IOB (U)
Effective Date: 27SEP2019, ECO-000240
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