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eAG Equation:
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The eAG (estimated Average Glucose) equation converts HbA1c percentage values to average glucose levels in mg/dL. This helps patients and healthcare providers better understand what HbA1c results mean in terms of daily glucose measurements.
The calculator uses the eAG equation:
Where:
Explanation: The equation provides an estimated average glucose level that corresponds to the HbA1c measurement, helping translate long-term glucose control into more familiar daily glucose values.
Details: Converting HbA1c to eAG helps patients better understand their diabetes control by relating it to the glucose meter readings they see daily. This improves patient engagement and diabetes self-management.
Tips: Enter HbA1c value as a percentage (e.g., 6.5 for 6.5%). The value must be greater than 0. The calculator will provide the estimated average glucose in mg/dL.
Q1: What is the relationship between HbA1c and average glucose?
A: HbA1c reflects average blood glucose levels over the past 2-3 months. The eAG calculation translates this percentage into an estimated average glucose value in mg/dL.
Q2: What are normal HbA1c and eAG values?
A: Normal HbA1c is below 5.7% (eAG < 117 mg/dL). Prediabetes range is 5.7-6.4% (eAG 117-137 mg/dL). Diabetes is diagnosed at 6.5% or higher (eAG ≥ 140 mg/dL).
Q3: How accurate is the eAG calculation?
A: The equation provides a good estimate for most people, but individual variations in red blood cell lifespan and other factors can affect the relationship between HbA1c and average glucose.
Q4: Can eAG replace daily glucose monitoring?
A: No, eAG provides an average but doesn't show glucose variability. Daily monitoring is still essential for adjusting insulin doses and managing hypoglycemia/hyperglycemia.
Q5: Are there different conversion formulas?
A: Yes, different organizations may use slightly different coefficients, but the ADAG study formula (28.7 × HbA1c - 46.7) is widely accepted and used in clinical practice.