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Understanding PDM and Pod Function 1212 Understanding PDM and Pod Function
Bolus Calculator equations
e Bolus Calculator rst calculates a preliminary correction and meal bolus. It
then adjusts these preliminary values for IOB, if applicable. e nal suggested
bolus is equal to the sum of the resulting correction bolus and meal bolus.
Preliminary correction bolus = Current BG - Target BG
Correction Factor
Example: Current BG: 11.2 mmol/L, Target BG: 5.6 mmol/L
Correction Factor (CF): 2.8
11.2 mmol/L – 5.6 mmol/L = 2 U prelim. correction bolus
2.8
Preliminary meal bolus =
Carb intake
Insulin-to-carb (IC) ratio
Example: Carb intake: 45 grams of carb, IC ratio: 15
45
= 3 U prelim. meal bolus
15
Final correction bolus = (prelim. correction bolus - meal IOB) - correction IOB
e meal IOB is subtracted rst. If the preliminary correction bolus is still
above zero, then the correction IOB is subtracted
Note: A correction bolus is never reduced below 0 U.
Final meal bolus = prelim. meal bolus - remaining correction IOB
Meal IOB is never subtracted from a meal bolus. Only a remaining correction
IOB is subtracted from a meal bolus (see “Remaining correction IOB” on
page 151).
Note: A meal bolus is never reduced below 0 U.
Calculated bolus = nal correction bolus + nal meal bolus
Reverse Correction bolus calculation: If the Reverse Correction feature is turned
on and if your current blood glucose is below your Target BG but above your
Minimum BG for Calcs, the Bolus Calculator subtracts a correction amount from
the preliminary meal bolus.
Meal bolus with Reverse Correction = Reverse Correction + prelim meal bolus
Example: Current BG: 4.2 mmol/L, Target BG: 5.6 mmol/L
Correction Factor: 2.8, Preliminary meal bolus: 1.5 U
4.2 mmol/L – 5.6 mmol/L = -0.5 U Reverse Correction
2.8
- 0.5 U (Reverse Correction) + 1.5 U (prelim meal bolus) = 1.0 U meal bolus
A Reverse Correction is only applied to the meal bolus. In this example, the
meal bolus is reduced by 0.5 units.
Effective Date: 27SEP2019, ECO-000240
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