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How VitalSync estimates your HbA1c from your logged glucose readings.
For informational and educational purposes only. VitalSync is not a medical device and does not diagnose, treat, cure, or prevent any medical condition. All content presents health data against established clinical reference ranges. Always consult a qualified healthcare professional for medical advice, diagnosis, or treatment.
Projected A1C Estimate
VitalSync calculates a projected HbA1c estimate from your logged glucose readings using the ADA's eAG (estimated Average Glucose) formula.
Formula
eAG (mg/dL) = (28.7 × A1C) − 46.7VitalSync inverts this to estimate A1C from your average glucose:
Projected A1C = (eAG + 46.7) ÷ 28.7Accuracy
This estimate requires at least 14 days of glucose readings across different times of day (fasting, post-meal, bedtime) for reasonable accuracy. The more readings you log, the more accurate the estimate.
Viewing Your Projected A1C
The projected A1C appears on the Blood Sugar detail screen with a colour-coded range indicator:
| Range | Colour |
| < 5.7% | Green (Within normal reference range) |
| 5.7–6.4% | Amber (Pre-diabetic reference range — ADA) |
| ≥ 6.5% | Red (Diabetic reference range — ADA) |
Important: This projected A1C is a mathematical estimate for informational and educational purposes only. It is not a medical diagnosis, and VitalSync does not diagnose, treat, cure, or prevent any medical condition. Always consult a qualified healthcare professional or your physician for an official HbA1c laboratory test and clinical interpretation.
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