Until recently, the only available measure of glucose values over time (or glycemic control) was A1c. CGM use, however, has made it possible to get a steady stream of glucose values throughout the day. Now, a new measure called “time in range,” can be used in partnership with A1c. Time in range refers to the percentage of time that glucose levels are in the target range. An international consensus was reached in June 2019 that outlined specific clinical guidelines for time in range targets, as well as targets for high and low glucose. The CGM needs to be worn at least 85% of the time to have enough values to see if goals are being met.
Here are the recommended targets.
Each CGM system allows you to print out a report called the Ambulatory Glucose Profile (AGP) which gives a detailed analysis of your time in range values.
You can reduce your risk of diabetes complications by getting 70% of your glucose values in the target range of 70 to 180 mg/dL. This can be a challenging target to reach. Improving your time in range by small amounts each week will help you reach the target. Work with your diabetes care team to find ways to make small changes that will get you closer to your goal.