How to use the Glucose Predict feature

The prediction appears on the Home screen and shows the likelihood of your glucose values being within range or going either low or high. It is based on your CGM values, carbohydrate and insulin data in the Logbook, and the time of day.

  • You will need:
    • At least 1 hour of CGM data
    • Internet connection on your device
    • A current glucose value above your Low Glucose threshold - 70 mg/dL [3.9mmol/L] -.

How to read the graph

Glucose prediction graph showing current and predicted levels

  • The large green dot in the graph and the number below the graph both show your current glucose value.
     
  • To the left of the dot, the graph shows your glucose values from the past 60 minutes as a solid line.
     
  • To the right of the dot, the dotted line represents the best estimate of your predicted values. The vertical grey bars behind the dotted line represent the level of uncertainty.

    Like all predictions, the uncertainty grows the further ahead you look. The level of uncertainty is represented by the length of the grey bars; the longer they are, the greater the uncertainty.

    Your actual glucose values might still end outside of these bars.

Values are color-coded. Values in green are in your target range, and deviations are shown in yellow/orange for highs and red/dark red for lows.

⏺ Orange = Very high  ⏺ Red = Low
⏺ Yellow = High ⏺ Dark red = Very low
⏺ Green = In range    

How to act on the predictions1

Glucose prediction graph showing current level and trend.

Predictions within 45 minutes

Accuracy: High
You can take action, but consider whether it makes sense to act immediately or wait a while. The right time of action depends on:

  • The time when a high or low is predicted.
  • The type of action you want to take.

For example, injecting rapid-acting insulin or eating fast-acting carbohydrates could change your glucose levels within 20 minutes. However slow-acting carbohydrates (e.g., a mixed meal with fat and protein) can have a delayed effect.

Glucose prediction graph showing current and predicted levels.

Predictions for more than 45 minutes

Accuracy: Moderate
No immediate action is needed. These predictions show your possible glucose excursions in the future, to make you aware of potential unwanted upcoming glucose levels and give you some time to prepare. 

The prediction will update every 5 minutes. Monitor the situation based on your CGM values and prepare for the possibility that carbohydrates or insulin will be needed later.

  • Explore the Accu-Chek SmartGuide App

    The Predict app can only make predictions based on the information it has collected, and there are some factors it cannot take into consideration. Keep in mind what to consider when using the predictive features. 

    Glucose fluctuations can affect the prediction The forecast will be less accurate if your glucose fluctuates strongly before the prediction is made. Strong fluctuations happen when your glucose values go up and down in a very short period.

What is the difference between the trend arrows and the predictions?

Graph showing glucose prediction with personal history, trend, and low glucose prediction for the next 2 hours.
The phone screen shows the glucose level at range, marked as 'In Range,' with a predicted trend and target range.
The trend arrow appears on the Home screen of the Accu-Chek SmartGuide app, next to your current glucose value. It estimates the general direction of your glucose, based on recent CGM readings and updates every 5 minutes.
The trend arrow helps you to:
  • Understand your current glucose value.
  • Know the current trend of your glucose.
  • Respond to developing glucose values.
Glucose prediction graph on phone screen showing current level, predicted trend, and target range over the next 2 hours.
The glucose prediction graph appears on the Home screen of the Accu-Chek SmartGuide Predict app. The graph predicts your upcoming glucose values for the next 2 hours, based on your CGM readings, Logbook data, and the time of day to help you stay ahead of excursions.
The prediction graph helps you to:
  • Understand your future glucose values.
  • Know when lows might happen.
  • Act or prepare to prevent glucose excursions.

Everyday life example

Watch the video below, or continue reading to find out how to use the Glucose Predict feature in your daily diabetes management.

How Anna uses the Glucose Predict feature to prepare for a trip

Anna has had diabetes for some years now. She injects insulin several times a day to keep her glucose in her target range. Anna wants to know where her glucose is heading, stay informed about her levels, and reduce frequent changes in her blood sugar levels.1

Today, she is going to visit her brother, who lives two hours away. Long car trips are often challenging for Anna because she worries about having low glucose while driving.5 Two hours before her trip, Anna had breakfast and injected herself with insulin.

Preparing with the 2-hour glucose prediction

Anna uses the Glucose Predict feature to check her estimated glucose values for the next 2 hours. Her glucose is currently higher than her target range, and her predicted levels are also slightly elevated.

Since her last insulin injection was only 2 hours ago, it would be too soon to correct the values. Another injection could now overlap with the last one and increase her risk of low glucose. Anna will take her insulin pen with her and check her glucose again when she gets to her brother’s house, to see if correction insulin is needed.

Staying informed about her glucose levels

Anna makes sure that notifications are enabled in both apps. Although it’s unlikely that she will have low glucose during her drive, the Predict app will update every 5 minutes and keep her informed about her glucose levels. The Low Glucose Predict feature would warn her if low glucose is likely within the next 30 minutes. And if her glucose drops below a customizable glucose threshold, the Low Glucose Alarm in the Accu-Chek SmartGuide app would let her know.

Starting the drive feeling prepared and secure

Anna always has a cereal bar and some glucose tablets in her bag, in case she needs them. She puts her phone in a holder, so she can hear any notifications while she’s driving and pull over to check the apps if needed. Anna can now relax and enjoy the drive, knowing she has prepared for the journey and will stay informed about her glucose levels.

Next up, learn more about the Low Glucose Predict feature in the Accu-Chek SmartGuide Predict app.

Continue training

1Simulation study, study data not published yet, data on file, Roche Diabetes Care GmbH, 2025
*Your country of residence may have special licensing and driving rules about medical conditions that may apply to people with diabetes. Please make sure that you check your local specifics before driving.

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