Accu-Chek Aviva Combo Advanced Owner's Booklet page 107

Correction Bolus with Carbohydrate Intake
Whenever carbohydrates have been entered, the related meal bolus is always offset against any (even
negative) correction bolus.
When a meal is eaten, the correction bolus is also calculated for blood glucose test results that fall within the
target range if:
• The current blood glucose test result falls below the target range average value, or
• The current blood glucose test result is above the currently allowed blood glucose value.
Since your pump can only deliver insulin, mathematically negative overall boluses are displayed as "0".
Active Insulin
The active insulin field shows you if a prior bG correction bolus may possibly reduce your current bolus
calculation.
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