Fructosamine Calculator
Estimate HbA1c and average glucose from fructosamine for a practical short-term view of glycemic exposure.
Last updated on: March 30, 2026
Calculate from Fructosamine
Clinical Significance
Fructosamine reflects average glycemic exposure over approximately the previous 2 to 3 weeks, making it useful when a shorter-term view is needed.
It can be helpful when HbA1c is less reliable or when recent treatment changes need to be assessed more quickly than HbA1c allows.
Formula and Example
This calculator uses an approximate conversion formula: Estimated HbA1c (%) = 0.017 × Fructosamine (µmol/L) + 1.61.
It then estimates average glucose from the estimated HbA1c using the ADAG relationship for practical interpretation.
Example: fructosamine 285 µmol/L gives an estimated HbA1c of about 6.5%, with an estimated average glucose of about 140 mg/dL or 7.8 mmol/L.
Reference Interpretation
Clinical Notes
Fructosamine is best viewed as a short-term glycemic marker. Estimated HbA1c from fructosamine is useful for interpretation but should not be treated as an exact laboratory equivalent in every patient.
- Fructosamine generally reflects glycemia over about 2 to 3 weeks.
- It may be useful when HbA1c is less informative or when therapy changed recently.
- Estimated HbA1c from fructosamine is approximate and depends on the conversion model used.
- Interpret together with glucose readings, treatment changes, protein status, and the overall clinical context.
This page has been medically reviewed by Dr. Khoulah Attia – PharmD, Immunology Specialist.