Glossary

AGP

The Ambulatory Glucose Profile (AGP) is a licensed, standardized glucose report created by the International Diabetes Center (IDC). AGP provides a standard set of information and graphs relating to your diabetes management and is only one part of understanding your glucose patterns.

The report is divided into these sections:

  • Glucose Statistics summarize the glucose values from the selected date range.
    • Glucose Exposure: The average of all the glucose readings in the selected date range.
    • Glucose Ranges: Percentage of time spent in each of the glucose ranges.
    • Glucose Variability: How far readings are from the average.
    • Data Sufficiency: Percentage of time CGM readings were provided.
  • Ambulatory Glucose Profile readings are combined to make a one day, 24-hour picture.
    • 50% Median: Half of glucose values are above this line and half are below.
    • 25/75%-IQR: Half of the glucose values are between these lines and half are outside these lines.
    • 10/90%: 80% of glucose values are between these lines.
  • Daily Glucose Profiles contain single day views of glucose values from the selected date range.

Average Glucose

The average of all the CGM glucose readings from the selected date range.

Coefficient of Variation

The Coefficient of Variation (%CV) is calculated by dividing the glucose Standard Deviation by the mean glucose. %CV is a standardized measure that assesses the magnitude of glucose variability. The larger the %CV, the larger the variability in CGM readings.

Daily Statistics

Daily statistics are calculated values for the individual day of the week over the date range selected. For example, if the date range is 14 days, all the CGM values collected on the two Mondays in that 14-day range are used in the Monday calculations.

Data Collection

It is possible to use both a smartphone and a receiver to provide CGM data.

The smartphone system sends data to the Dexcom server, where that data is made available for reports. To receive this data, the smartphone needs to be connected to the internet and have the Dexcom Mobile CGM app running.

The Dexcom receiver requires connection to a computer to upload the data periodically. If the patient uses a smartphone part of the time and a receiver part of the time, then Dexcom CLARITY needs data from both to provide accurate statistics.

Please refer to Uploading Receivers for more details.

Glucose Management Indicator (GMI)

Glucose Management Indicator (GMI) approximates the laboratory A1C level expected based on average glucose measured using continuous glucose monitoring (CGM) values. Average glucose is derived from at least 12 days of CGM data. The GMI may be similar to, higher than, or lower than the laboratory A1C. Differences between GMI and laboratory A1C may reflect differences among an individual’s red blood cell lifespan, how glucose binds to hemoglobin, or due to a recent fluctuation in glucose control.

Clinical Reference:

Bergenstal, RM, et al. Glucose Management Indicator (GMI): A New Term for Estimating A1C From Continuous Glucose Monitoring. Diabetes Care. 2018 Nov;41(11):2275-2280.

Hourly Statistics

Hourly statistics are calculated values for the individual hour of the day over the date range selected. For example, if the date range is 7 days, all CGM values collected for each individual hour for each of the 7 days would be used in the calculations.

Insulin Data

This feature is only available for Dexcom compatible connected insulin devices. Connected insulin devices have Bluetooth capability and require pairing with their app. To see insulin data in Dexcom CLARITY, use the connected insulin device app to connect to Dexcom.

Dexcom CLARITY provides the following insulin statistics as manually entered into Dexcom apps, or as collected by a connected insulin device.

  • Fast-Acting to Long-Acting Insulin Ratio compares fast-acting doses to long-acting doses. Long-acting doses may need to be configured in the connected device to display in Dexcom CLARITY.
  • Average Total Daily Dose: The average amount of daily insulin doses in the selected date range.
  • Average Daily Fast-Acting Doses: The average number of fast-acting insulin doses per day in the selected date range.

Sensor Usage

Sensor Usage provides a high-level view of Dexcom CGM device usage.

  • Days with CGM data shows the number of days during the reporting period with at least 50% CGM readings.
  • Avg. calibrations per day displays the average number of calibrations per day, entered by the patient, during the reporting period. Only days with at least 50% CGM readings are included. The Dexcom G6 system is approved for use without calibrations or optionally with calibrations, making it possible to have zero average daily calibrations.

Please refer to Data Collection for more details.

Standard Deviation

Shows how much CGM glucose readings rise and fall. This is also known as glycemic variability.

Time in Range

The percentage of time that glucose levels are in low, target, and high ranges. The following are recommended ranges from an international consensus. Dexcom CLARITY ranges may be different than Dexcom CGM alerts. Changes made here apply only to Dexcom CLARITY.

  • Target Range: 70-180 mg/dL or 3.9-10.0 mmol/L
  • Very High: Above 250 mg/dL or 13.9 mmol/L
  • Very Low: Below 54 mg/dL or 3.0 mmol/L

Uploading Receivers

Dexcom receivers store about 30 days of CGM readings with 120 Calibrations. It is important to upload Dexcom receiver data to Dexcom CLARITY at least every 30 days to ensure data is not lost.

Very Low

Choose 50 mg/dL or 54 mg/dL (2.8 mmol/L or 3.0 mmol/L) as the limit for Very Low displays within Dexcom CLARITY reports. Changing this setting does not change the Dexcom CGM settings.

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