1. What is GMI?

GMI (Glucose Management Indicator) is a calculated value that estimates A1c based on continuous glucose monitoring (CGM) data. It provides an alternative to traditional A1c measurements, especially useful for people using CGM devices.

2. How Does the Calculator Work?

The calculator uses the GMI formula:

Where:

• \( \text{mean\_glucose\_mgdl} \) — Average glucose level from CGM data (mg/dL)

Explanation: This formula converts mean glucose values from CGM into an estimated A1c percentage, providing a standardized way to interpret glucose data.

3. Importance of GMI Calculation

Details: GMI helps in diabetes management by providing a more immediate feedback on glucose control compared to traditional A1c tests which reflect average glucose over 2-3 months.

4. Using the Calculator

Tips: Enter the mean glucose value from your CGM data in mg/dL. The value should be greater than 0 for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is GMI compared to lab A1c?
A: GMI provides a good estimate but may differ from lab A1c due to individual variations in red blood cell turnover and other factors.

Q2: What's the normal range for GMI?
A: For people without diabetes, GMI is typically below 5.7%. For diabetes management, targets are usually below 7.0% but should be individualized.

Q3: How often should I calculate my GMI?
A: It's recommended to calculate GMI regularly, typically every 2-4 weeks, to track trends in glucose management.

Q4: Can GMI replace traditional A1c testing?
A: While GMI is a valuable tool, it should complement rather than replace traditional A1c testing, especially for clinical decision making.

Q5: What if my GMI and lab A1c differ significantly?
A: Significant differences may indicate issues with CGM accuracy, changes in red blood cell turnover, or other medical conditions. Consult your healthcare provider.