Information about a laboratory test
Measures glycated serum proteins and reflects glucose exposure over roughly the previous 2–3 weeks.
Measures glycated serum proteins and reflects glucose exposure over roughly the previous 2–3 weeks.
May be used when A1C is unreliable or when a shorter-term view of glycemic change is useful.
Low fructosamine can reflect lower glucose exposure but may also be affected by low serum-protein concentrations.
High fructosamine may reflect higher glucose exposure over recent weeks; serum-protein status can influence the result.
Use the performing laboratory's report and the sampling conditions first. Fasting status, timing, and whether the test is diagnostic or for monitoring can change interpretation.
>= 200 – <= 285 µmol/L
Example reference interval
The source laboratory gives >=200–<=285 µmol/L as an example interval. Use the performing laboratory's own reference interval for an individual result.
Reference ranges may vary by laboratory, method used, age, sex, pregnancy status, and clinical context. The reference range on your own laboratory report takes precedence.
Fructosamine covers a shorter time window than A1C. Albumin/protein changes and assay method can affect interpretation.
The A1C Test & Diabetes — National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
U.S. government medical reference · 2026 · A1C meaning, diagnostic use, pregnancy and hemoglobin-related limitations · Verified: Aug 12, 2026
The A1C Test & Race/Ethnicity — National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
U.S. government medical reference · 2026 · Fructosamine as a shorter-term glycemic marker when A1C may be unreliable · Verified: Aug 12, 2026
Fructosamine, Serum — Mayo Clinic Laboratories
Reference laboratory test catalog · 2026 · Example fructosamine reference interval and short-term glycemic context · Verified: Aug 12, 2026
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