Clinical Chemistry
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Clinical Chemistry 37: 1252-1256, 1991;
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Clinical Chemistry, Vol 37, 1252-1256, Copyright © 1991 by American Association for Clinical Chemistry

Clinical validation of a second-generation fructosamine assay

WT Cefalu, AD Bell-Farrow, M Petty, C Izlar and JA Smith
Department of Medicine, Bowman Gray School of Medicine, Winston-Salem, NC 27103.

The serum fructosamine assay, used to monitor short-term clinical glycemic control, reportedly has several technical drawbacks. However, technical improvements have resulted in a new second-generation assay of fructosamine. We evaluated this second-generation assay (from Roche Diagnostics) in 529 nondiabetic and diabetic patients and found a highly significant correlation with results of the first-generation assay (r = 0.91, P less than 0.001). Use of the second-generation assay with samples from patients classified on the basis of glycemic control according to their glycohemoglobin (GHb) values, enabled us to discriminate between the nondiabetics, diabetics with "good/moderate" control (i.e., GHb less than 10%), and diabetics with "poor" control (GHb greater than or equal to 10%). We evaluated the validity of the second-generation assay to assess short-term glycemic control in 23 non- insulin-dependent diabetic patients who participated for 10 weeks in an intensive intervention program designed to rapidly normalize the clinical glycemic profile. Results correlated significantly with the one-week average capillary blood glucose concentration (CBG) and with the three-week average CBG in all 23 patients. In addition, the second- generation fructosamine assay results demonstrated a significant decrease at each week of study, as did the average CBG. Results of the first- and second-generation assays correlated significantly at each week of study. GHb correlated significantly with both the second- (r = 0.78, P less than 0.001) and first-generation fructosamine assay results (r = 0.77, P less than 0.001) for the baseline blood samples of the intervention study, but this correlation decreased (to r = 0.35, P = 0.09 and r = 0.34, P = 0.09, respectively) by the conclusion of the study.


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