How to Download Your Dexcom or Stelo Glucose Data and Analyze It Yourself
Export a CSV from Dexcom Clarity or Stelo, then drop it on the free browser report at healthosx.com/glucose for AGP, time in range, GMI and variability.
Your Dexcom or Stelo glucose data is a CSV or Excel export you can download from Dexcom Clarity or the Stelo app, and the fastest way to analyze it yourself is to drop that file on the free browser report at https://healthosx.com/glucose. No account, no upload: the file is read on your device and the report shows your AGP, time in range, GMI, variability and biggest rises.
How do I download my Dexcom or Stelo glucose data?
- 1.On a computer, log in at clarity.dexcom.com for Dexcom, or open the Stelo app for Stelo.
- 2.Choose the date range you want. Fourteen days or more makes the GMI steadier.
- 3.Look for Export, Download data, or Download CSV and save the file.
The export is usually a .csv file, sometimes a .zip containing several CSVs. The browser report accepts .csv, .xlsx, .txt, Apple Health export.zip and several files at once.
What the CSV actually contains
A Dexcom or Stelo export typically has at least a timestamp and a glucose reading in mg/dL or mmol/L. It may also include event markers for meals, insulin, exercise or notes if you logged them in the app. The report reads the timestamp and glucose columns and ignores the rest. If your file uses a different column order, the tool still handles the common formats.
What the free report gives you
Drop the file on https://healthosx.com/glucose and the report is drawn in your browser. It gives you:
- A 24-hour AGP: all your days laid on one clock. The middle line is the median, the darker band holds the middle half of your days, and the lighter band holds 90% of them.
- Time in range, using the 70 to 180 mg/dL band set for people with diabetes.
- GMI, an estimate of the A1C that usually goes with your average sensor glucose. The formula is 3.31 + 0.02392 × your average in mg/dL. It is most reliable with 14 days or more, and it is not a lab test.
- Variability as CV. Lower means steadier.
- Your biggest rises and what happened overnight, including a flag for short dips that look like sensor pressure.
Illustrative. The line shows a median day; the real report adds percentile bands.
The file never leaves your device. You get the analysis without handing over your glucose readings.
What the report can and can't tell you
The report shows the shape of your glucose. It does not know why a rise happened. A morning spike could be breakfast, stress, poor sleep, the order of a workout, or medication. You still need to match the clock to your own day.
The sensor itself reads fluid under the skin, not blood. It trails a finger-prick by roughly 5 to 15 minutes, and the first day of each sensor is the least reliable. Overnight dips that snap back quickly are often compression lows from lying on the sensor. The report flags those, but if you see lows you cannot explain or you feel unwell, check with a finger-prick meter and talk to a doctor. This is a learning tool, not a medical device.
Using another sensor or Apple Health
The same free report accepts LibreView, Lingo, SiBionics, Apple Health export.zip, or any CSV with times and readings. Only the Dexcom G7, Stelo and Lingo apps write glucose to Apple Health, and that data arrives about 3 hours late. FreeStyle Libre does not write glucose to Apple Health, so use the LibreView CSV for that sensor.
Open the free report at https://healthosx.com/glucose and drop your Dexcom or Stelo export to see your own AGP, time in range and biggest rises. If you do not have a sensor, HealthOS Sensor is $70 for a 30-day supply with no membership at https://healthosx.com/glucose/sensor. It does not ship to the United States.
Written by
HealthOS Research