Fructosamine

The basics

Fructosamine is the collective name for glycated serum proteins - chiefly albumin - formed when glucose binds to proteins circulating in your blood. Because these proteins turn over in roughly 2–3 weeks, far faster than the ~120-day lifespan of red blood cells, fructosamine reflects your average blood glucose over the past two to three weeks: a shorter, faster-moving window than HbA1c.

Why this marker matters

Fructosamine captures recent shifts in blood-sugar control, so it responds to a change in diet, activity, or medication weeks before HbA1c would. It is particularly useful when HbA1c is unreliable - for example with altered red-blood-cell turnover (some anaemias, haemoglobin variants, recent transfusion, or pregnancy) - where it gives a clearer read on recent glycaemic control.

Where the typical ranges sit

Commonly ~205–285 µmol/L in adults without diabetes - laboratory-dependent.

A frequently cited adult non-diabetic range is roughly 205–285 µmol/L, but fructosamine ranges vary between laboratories and assays and must be read alongside serum albumin (low albumin can falsely lower the value). Unlike HbA1c there are no universally agreed diagnostic thresholds, so fructosamine is used mainly to track trends in recent glycaemic control rather than to diagnose diabetes.

Reference ranges differ between laboratories and guidelines. Your CHIRAYOU report uses the range reported by the analysing laboratory, and your interpretation should be discussed with a physician.

Common influencers

• Average blood glucose over the previous 2–3 weeks
• Serum albumin and total protein levels (low protein lowers the result)
• Conditions with rapid protein turnover (nephrotic syndrome, liver disease)
• Thyroid dysfunction
• Dietary carbohydrate quality and overall calorie intake
• Physical activity and body weight

If your value is outside the range

A single fructosamine value is not a diagnosis. If it sits above the typical range - particularly alongside other metabolic findings - discussing it with a physician is the appropriate next step, especially since low serum albumin can artefactually lower the result and needs to be accounted for in interpretation.

Where this comes from

• Danese E. et al. - Advantages and Pitfalls of Fructosamine and Glycated Albumin in the Diagnosis and Treatment of Diabetes (Journal of Diabetes Science and Technology, 2015)
• Armbruster D. A. - Fructosamine: structure, analysis, and clinical usefulness (Clinical Chemistry, 1987)