Fructosamine

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Also known as: Glycated Serum Protein; GSP; Glycated Albumin
Formal name: Fructosamine

At a Glance

Why Get Tested?

To help monitor your blood sugar levels over time if you have diabetes mellitus, especially if it is not possible to monitor your diabetes using the A1C test; to help determine the effectiveness of changes to your diabetic treatment plan that might include changes in diet, exercise or medications

When to Get Tested?

When you are diabetic and your doctor wants to evaluate your average blood glucose level over the last 2-3 weeks

Sample Required?

A blood sample drawn from a vein in your arm or sometimes from a fingerstick

Test Preparation Needed?

None

The Test Sample

What is being tested?

Fructosamine is a compound that is formed when glucose combines with protein. The fructosamine test is a measurement of this glycated protein. When glucose levels in the blood are elevated over a period of time, glucose molecules permanently combine with proteins in the blood in a process called glycation. Affected proteins include albumin, the principal protein in the blood, other serum proteins, and hemoglobin, the major protein found inside red blood cells (RBCs). The more glucose that is present in the blood, the greater the amount of glycated proteins that are formed. These combined molecules persist for the life of the protein or RBC and provide a record of the average amount of glucose that has been present in the blood over that time period.

Since RBCs live for about 120 days, glycated hemoglobin (hemoglobin A1C) represents a measurement of the average blood glucose level over the past 2 to 3 months. Serum proteins have a shorter lifespan, about 14 to 21 days, so glycated proteins, and the fructosamine test, reflect average glucose levels over a 2 to 3 week time period.

Keeping blood glucose levels as close as possible to normal helps those with diabetes to avoid many of the complications and progressive damage associated with elevated glucose levels. Good diabetic control is achieved and maintained by daily (or even more frequent) self-monitoring of glucose levels in insulin-treated diabetics and by occasional monitoring of the effectiveness of treatment using either a fructosamine or A1C test.

How is the sample collected for testing?

A blood sample is obtained by inserting a needle into a vein in the arm or from a fingerstick.

NOTE: If undergoing medical tests makes you or someone you care for anxious, embarrassed, or even difficult to manage, you might consider reading one or more of the following articles: Coping with Test Pain, Discomfort, and Anxiety, Tips on Blood Testing, Tips to Help Children through Their Medical Tests, and Tips to Help the Elderly through Their Medical Tests.

Another article, Follow That Sample, provides a glimpse at the collection and processing of a blood sample and throat culture.

Is any test preparation needed to ensure the quality of the sample?

No test preparation is needed.

The Test

Common Questions

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Article Sources

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NOTE: This article is based on research that utilizes the sources cited here as well as the collective experience of the Lab Tests Online Editorial Review Board. This article is periodically reviewed by the Editorial Board and may be updated as a result of the review. Any new sources cited will be added to the list and distinguished from the original sources used.

Sources Used in Current Review

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Grenache, D. et. al. (Updated 2011 April). Diabetes Mellitus. ARUP Consult [On-line information]. Available online at http://www.arupconsult.com/Topics/DiabetesMellitus.html?client_ID=LTD#tabs=0 through http://www.arupconsult.com. Accessed July 2011.

(© 1995–2011). Unit Code 81610: Fructosamine, Serum. Mayo Clinic Mayo Medical Laboratories [On-line information]. Available online at http://www.mayomedicallaboratories.com/test-catalog/Overview/81610 through http://www.mayomedicallaboratories.com. Accessed July 2011.

Khardori, R. (Updated 2011 June 30). Type 1 Diabetes Mellitus. Medscape Reference [On-line information]. Available online at http://emedicine.medscape.com/article/117739-overview through http://emedicine.medscape.com. Accessed August 2011.

Pagana, K. D. & Pagana, T. J. (© 2011). Mosby’s Diagnostic and Laboratory Test Reference 10th Edition: Mosby, Inc., Saint Louis, MO. Pp 508-510.

William E. Winter, MD, FACB. Lab Tests Online adjunct board member.

Sources Used in Previous Reviews
Pagana, Kathleen D. & Pagana, Timothy J. (© 2007). Mosby's Diagnostic and Laboratory Test Reference 8th Edition: Mosby, Inc., Saint Louis, MO. Pp 503-505.

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Smiley, D. et. al. (2008 January 23). Therapy Insight: Metabolic and Endocrine Disorders in Sickle-cell Disease. Medscape CME [On-line information]. Available online through http://www.medscape.com. Accessed on 1/30/08.

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