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eAG Formula:
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The fructosamine to glucose conversion estimates average glucose levels from fructosamine measurements. This provides an alternative to HbA1c for monitoring glycemic control, particularly useful when HbA1c may be unreliable.
The calculator uses the conversion formula:
Where:
Explanation: This formula converts fructosamine levels to estimated average glucose (eAG) values, providing an alternative measure of glycemic control over approximately 2-3 weeks.
Details: Fructosamine measurement and conversion to eAG is particularly valuable in situations where HbA1c may be unreliable, such as in hemoglobinopathies, anemia, pregnancy, or when monitoring short-term glycemic changes.
Tips: Enter fructosamine level in μmol/L. The value must be greater than 0. The calculator will provide the estimated average glucose in mg/dL.
Q1: Why use fructosamine instead of HbA1c?
A: Fructosamine reflects average glucose over 2-3 weeks (vs 2-3 months for HbA1c) and isn't affected by hemoglobin variants or red cell turnover.
Q2: What are normal fructosamine values?
A: Normal fructosamine levels typically range between 200-285 μmol/L, but reference ranges may vary by laboratory.
Q3: When should fructosamine be measured?
A: It's useful when recent glycemic control needs assessment, in conditions affecting red blood cell lifespan, or during pregnancy.
Q4: Are there limitations to this conversion?
A: The relationship between fructosamine and glucose can be affected by serum protein concentrations and other factors. Always interpret results in clinical context.
Q5: How does eAG from fructosamine compare to eAG from HbA1c?
A: They measure different timeframes (2-3 weeks vs 2-3 months) and may not always correlate perfectly due to different biological processes.