Insulin On Board (Iob) - Insulet Omnipod Dash User Manual

Understanding PDM and Pod Function 12

Insulin on board (IOB)

After a bolus is delivered, the amount of insulin that is active in the body decreases
over several hours. The Bolus Calculator approximates this decrease in insulin by
calculating an "insulin on board" (IOB) value. The 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.
8 U
6 U
4 U
2 U
0
17:00 18:00
Take 8 U bolus at 18:00
Duration of Insulin Action set to 4 hrs
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. The 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. The 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. The 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
1 hr after the bolus: IOB = 6 U
2 hrs after the bolus: IOB = 4 U
20:00 21:00
19:00
4 hrs after the bolus,
IOB has returned to zero
3 hrs after the bolus: IOB = 2 U
22:00 23:00
4 U
2 U
0
18:00 20:00
4 U
Correction IOB
2 U
0
18:00 20:00
4 U
Meal IOB
Correction IOB
2 U
0
18:00
20:00
Effective Date: 27SEP2019, ECO-000240
Meal IOB
22:00
22:00
22:00
147