How-To Guide

Bolus
type
Description Purpose
Square
Wave
bolus
Square Wave bolus
delivers a single bolus
evenly over an extended
period of time from
30 minutes up to
8 hours.
You might use a Square Wave bolus for the
following reasons:
• You have delayed food digestion due to
gastroparesis or meals high in fat.
• When you snack over an extended period
of time.
• A Normal bolus drops your BG too rapidly.
For details about using the Square Wave
bolus feature, see Square Wave bolus, on
page 101.
Dual Wave
bolus
Dual Wave bolus delivers
a combination of an
immediate Normal bolus
followed by a Square
Wave bolus.
You might use a Dual Wave bolus for the
following reasons:
• When you eat meals that are both high in
carbs and fat which may delay digestion.
• When your meal bolus is combined with a
correction bolus for an elevated BG.
For details about using a Dual Wave bolus,
see Dual Wave bolus, on page 104.
Bolus type example
The following example shows how the different bolus types work.
Hours
Hours
0 1 2 3
Hours
Units of insulin
Normal (N) bolus
0 1 2 3
0 1 2 3
Bolus
over time
Bolus
now
Bolus
now
Square Wave (S) bolus Dual Wave (D) bolus
Bolus
over time
84 Chapter 4