Fructosamine measures the level of glycated proteins in your blood. Because proteins turn over more quickly than red blood cells, a fructosamine test reflects average glucose over the past two to three weeks—much sooner than the three-month window provided by an A1C test. Doctors may order this test when monitoring shorter-term changes in diabetes therapy or when conditions like anemia interfere with A1C accuracy.
Research shows an approximate linear relationship between fructosamine and both A1C and estimated average glucose (eAG). One widely used formula converts fructosamine to A1C:
We can combine this with the ADAG relationship between A1C and eAG () to directly estimate average glucose from fructosamine:
These relationships are approximations, but they can help translate a lab result into terms you already know from daily glucose checks.
Enter either your fructosamine level or your estimated average glucose, then click Convert. The other field will fill in automatically based on the equations above. If you input both, the fructosamine value takes priority to keep the conversion consistent.
Just like A1C, fructosamine can be influenced by factors beyond average glucose, such as protein turnover from thyroid conditions or high-dose vitamin C supplementation. Always discuss lab results and management plans with your healthcare provider.
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