# Insulin Pump Calculator

Insulin pump calculator

The Initial Insulin Pump Requirements calculator estimates the initial insulin requirements for when you first use your insulin pump.

Before starting to use an inulin pump, patients should be instructed on how best to operate a pump by their healthcare professional.

As well as pump operation, patients need instruction in how to insert and care for their infusion set, and how to deal with any problems.

The Insulin Pump Forum on the Diabetes Forum is a great resource for helping with this.

Usually, the insulin pump will require around 80 per cent of the insulin requirement before beginning pump therapy. 50% of the insulin is given at the basal rate, whilst the other 50% if divided into three premeal boluses.

The initial insulin dose calculator will help patients to estimate their initial insulin requirements.

Insulin Pump Calculator
The Initial Insulin Pump Requirements calculator estimates the initial insulin requirements for when you first use your insulin pump.
Estimate your initial insulin requirements based on your daily insulin dose and insulin type. This is an estimate only.
Insulin Type

Daily insulin dose:

units per day
Calculate the amount of insulin required to cover a particular carbohydrate intake.
Total daily insulin bolus:
units
Total daily carbohydrate intake:
grams
Grams of carbs to be covered:
grams
Estimate the amount of insulin needed to correct an elevated premeal sugar by the 1500 rule for regular insulin or 1800 rule for Humalog.
Insulin Type

Total daily insulin dose:
units/day
Premeal blood sugar:
mg/dL
Target blood sugar:
mg/dL
Grams of carbs to be eaten
mg/dL

## Basal Rate

Fig 1: Example basal rate settings for a patient with Dawn phenomenon
Begin time Basal rate
12:00 AM 0.6 U/hour
4:00 AM 0.8 U/hour
10:00 AM 1.0 U/hour

The basal rate is adjusted following closely monitoring the blood glucose levels over a 24-hour period. To accurately calculate how much is needed, blood sugar levels are obtained before meals, one hour after meals, at bedtime, at 12.00 AM and at 3.00 AM.

The goal of adjusting the basal rate is to maintain the desired range of blood glucose levels.

The basal rate is adjusted very slightly in 0.1-0.2 U/hr increments to keep premeal and overnight blood glucose within 1.7 mmol/L (30 mg/dl) of the desired range. In some instances, basal insulin requirements will be less at certain hours of the day.

Furthermore, some patients experience Dawn phenomenon, which is resistance to insulin due to increased growth hormone levels occurring early in the morning, and will need more basal insulin.

## Pre-meal Boluses

Boluses will be adjusted according to postmeal blood glucose levels.

The pre-breakfast bolus will normally be ~ 8 units. Pre-lunch and pre-dinner boluses are usually lower, at around ~ 4 units.

Correction of the bolus may be required if the premeal blood sugar is too high or low.

## Covering Carbohydrate with insulin

A rule known as the 450 or 500 Rule can be used to calculate the amount of insulin used to cover a particular intake of carbohydrates.

Insulin/Carb ratio can be understood by using the calculation: 450/total insulin dose=grams of carbohydrate covered by 1 unit of insulin.

This calculator can help you to calculate the amount of insulin required to cover a certain amount of carbohydrate.

## Correction Bolus

A premeal blood sugar reading can be alarming if it is elevated. The amount of insulin necessary to correct this level may be estimated using the 1500 rule (for regular insulin) or the 1800 rule (for Humalog).

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