Lab A1C and estimated A1C are not the same thing
A laboratory A1C result is produced from a blood sample ordered or performed by a healthcare professional. An estimated A1C is a mathematical estimate based on glucose data.
Glucose supports both as different kinds of information:
- You can record a lab A1C result in your history.
- The app can display an estimated A1C based on logged glucose readings.
An estimate can be incomplete or misleading when readings are sparse, unrepresentative, or affected by factors the calculation does not know. It is not a diagnosis, a replacement for a lab result, or a reason to change treatment.
What an A1C tracker can help organize
Keep results with the rest of your history
Instead of leaving an A1C result in a message, paper report, or separate notes app, you can add it to the same history as glucose, insulin, medications, weight, and other metrics you choose to track.
Review the period around a result
Glucose includes 7-, 30-, and 90-day average views. These can make it easier to review the logged period around a lab test and prepare questions for your next appointment.
See an estimate between lab tests
The estimated A1C view is intended as a trend aid. It becomes more meaningful only when the underlying glucose records are consistent enough to represent your usual range. Even then, it remains an estimate.
Share a selected record
PDF and CSV exports can put readings and tracked metrics into a format that is easier to discuss with a clinician. Your healthcare professional should interpret lab results and advise you on targets.
How to use the feature responsibly
- Enter the lab result exactly as reported.
- Keep the result date attached to the entry.
- Treat estimated A1C as a trend, not a lab value.
- Avoid comparing estimates produced from different or incomplete sets of readings.
- Ask a clinician about discrepancies between an estimate and a laboratory result.
What Glucose does not do
Glucose does not perform an A1C test, validate a laboratory result, diagnose diabetes, or recommend changes to medication or insulin. Its role is to help you organize the data you choose to record.