How To Calculate Estimated Average Glucose From A1c

eAG Formula:

\[ eAG (mg/dL) = 28.7 \times HbA1c (\%) - 46.7 \]

Estimated Average Glucose (eAG):

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1. What is the eAG Formula?

The eAG (estimated average glucose) formula converts HbA1c percentage to an average glucose value in mg/dL. This provides a more intuitive understanding of blood glucose control for patients with diabetes.

2. How Does the Calculator Work?

The calculator uses the eAG formula:

\[ eAG (mg/dL) = 28.7 \times HbA1c (\%) - 46.7 \]

Where:

\( HbA1c \) — Glycated hemoglobin percentage
28.7 — Conversion coefficient
46.7 — Adjustment factor

Explanation: The formula provides an estimated average glucose level that corresponds to the measured HbA1c value, helping patients relate their long-term glucose control to daily glucose measurements.

3. Importance of eAG Calculation

Details: Converting HbA1c to eAG helps patients better understand their diabetes control by translating the percentage into familiar glucose units (mg/dL), making it easier to relate to self-monitoring results.

4. Using the Calculator

Tips: Enter HbA1c value as a percentage. The value must be greater than 0. The calculator will provide the corresponding estimated average glucose in mg/dL.

5. Frequently Asked Questions (FAQ)

Q1: Why convert HbA1c to eAG?
A: eAG provides a more intuitive measure for patients, translating the HbA1c percentage into average glucose levels that correspond to their daily glucose meter readings.

Q2: How accurate is the eAG conversion?
A: The conversion is based on large clinical studies and provides a good estimate, though individual variations may occur due to factors like red blood cell lifespan.

Q3: What is the relationship between HbA1c and average glucose?
A: HbA1c reflects average blood glucose over the past 2-3 months, with each 1% change in HbA1c corresponding to approximately 30 mg/dL change in average glucose.

Q4: Are there different conversion formulas?
A: Yes, different studies have produced slightly different coefficients, but the ADAG study formula (28.7 × HbA1c - 46.7) is widely accepted and used.

Q5: Can eAG replace daily glucose monitoring?
A: No, eAG provides an average but doesn't show glucose variability. Both HbA1c/eAG and regular self-monitoring are important for comprehensive diabetes management.