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Fructosamine – Blood Marker for Diabetes Explained
Fructosamine is a blood marker that reflects average blood glucose levels over the past 2–3 weeks and is primarily used in the management of diabetes mellitus.
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Fructosamine is a blood marker that reflects average blood glucose levels over the past 2–3 weeks and is primarily used in the management of diabetes mellitus.
What is Fructosamine?
Fructosamine refers to glycated proteins in the blood – proteins that have chemically bonded with glucose (blood sugar). Because blood proteins have a shorter lifespan than red blood cells, the fructosamine level reflects the mean blood glucose over the preceding 2 to 3 weeks. The most abundant component is glycated albumin, which constitutes the majority of the measured value.
Clinical Significance
The fructosamine test is primarily used in the diagnosis and monitoring of diabetes mellitus. It complements the HbA1c value, which reflects a period of approximately 8–12 weeks, and is particularly useful when a short-term assessment of blood glucose control is needed.
- Provides faster feedback on changes in blood glucose management
- Suitable in cases of haemolytic anaemia or other conditions that may distort HbA1c results
- Useful in pregnancy (gestational diabetes) due to increased blood protein turnover
- Monitoring after therapy changes in Type 1 and Type 2 diabetes mellitus
Procedure and Reference Values
Fructosamine is measured from a simple blood sample (serum). No special preparation or fasting is generally required.
Reference values vary by laboratory but are typically:
- Normal range: 200–285 µmol/l
- Well-controlled diabetes: below 350 µmol/l
- Poorly controlled diabetes: above 350 µmol/l
In gestational diabetes, reference values may differ from the standard adult ranges.
Influencing Factors and Limitations
The fructosamine value can be influenced by several factors:
- Low blood protein levels (e.g., in liver disease, nephrotic syndrome, or malnutrition) can falsely lower the result.
- Increased protein turnover (e.g., hyperthyroidism) also affects the outcome.
- Unlike HbA1c, fructosamine is not influenced by the lifespan of red blood cells, making it advantageous when blood count abnormalities are present.
Fructosamine vs. HbA1c
Both fructosamine and HbA1c are long-term markers of blood glucose control, but they differ in their observation window and clinical use:
- Fructosamine: Covers the past 2–3 weeks; suitable for short-term monitoring.
- HbA1c: Covers the past 8–12 weeks; the gold standard for long-term diabetes control.
Both tests can complement each other to provide a comprehensive picture of a patient's glycaemic control.
References
- World Health Organization (WHO): Use of Glycated Haemoglobin (HbA1c) in the Diagnosis of Diabetes Mellitus, 2011. Available at: https://www.who.int
- American Diabetes Association (ADA): Standards of Medical Care in Diabetes, Diabetes Care, 2023.
- Goldstein DE, Little RR, Lorenz RA et al. – Tests of Glycemia in Diabetes. Diabetes Care, 2004; 27(7): 1761–1773.
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