Estimated HbA1c

Estimated HbA1c: what it is and how to use it

The estimated HbA1c (or estimated average glucose) is a value generated automatically by the app based on the glucose readings you log in the diary. It gives an approximate view of your glycemic control over the last 90 days (about 3 months).

How it's calculated

The app calculates the average of your glucose over the last 90 days — a window close to what the lab test represents (about 3 months) — and applies the ADAG formula, the standard for estimating the equivalent glycated hemoglobin (HbA1c) value.

For the estimate to appear, you need a minimum of data in that window: at least 30 glucose readings spread across 14 or more days within the last 90 days. Below that, the app does not show the estimate, to avoid an unreliable value.

🔍 Important: The result is an estimate, not a lab test.

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Important limitations

The accuracy of the estimated HbA1c depends directly on the quality of your records:

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Factor

Impact on the estimate

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Measurement frequency

The more readings per day, the more reliable

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Time distribution

Measuring only while fasting can skew the average

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Logging consistency

Days without records create gaps in the calculation

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⚠️ The more complete and frequent your diary is, the closer the estimate tends to be to reality. However, it never replaces the laboratory blood test.

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Reference values

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Estimated HbA1c

Interpretation

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Below 7%

Often the target for most people with diabetes, according to clinical guidelines

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Above 7%

May indicate a need to review the treatment plan

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💡 Consult your doctor to learn your individualized target for your case.

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How to use this feature

✅ For:

Tracking trends between appointments

Identifying whether routine or medication changes are having an effect

Getting an overview of your glycemic control

❌ Not for:

Diagnosing diabetes

Adjusting medications without medical guidance

Replacing the laboratory HbA1c test

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Where to find the estimated HbA1c in the app

Open the Reports or Summary screen (depending on the version)

Look for the estimated HbA1c or estimated average glucose indicator

The value updates automatically as new records are added

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Practical example

{% table %}

Situation

Estimate reliability

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You measure glucose 4 to 6 times a day (fasting, pre-meals, post-meals, bedtime)

✅ High – good distribution

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You measure only while fasting in the morning

⚠️ Low – doesn't reflect the whole day

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You log only 2 days a week

❌ Very low – insufficient sampling

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🧪 Recommendation: Keep getting the laboratory HbA1c test every 3 months (or as advised by your doctor). Use the app's estimated HbA1c as a continuous thermometer between one lab draw and the next.

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⚠️ Important notice: The estimated HbA1c is provided for monitoring and awareness purposes only. It does not replace medical evaluation. Any decision about adjusting medications, diet, or insulin must be made exclusively under the guidance of your doctor or healthcare team.

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