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. 2023 Oct 18;108(11):e1193-e1198.
doi: 10.1210/clinem/dgad298.

Glycated Albumin Correlates With Time-in-Range Better Than HbA1c or Fructosamine

Cyrus V Desouza  1 , Julio Rosenstock  2 , Takuji Kohzuma  3 , Vivian A Fonseca  4
Affiliations

Glycated Albumin Correlates With Time-in-Range Better Than HbA1c or Fructosamine

Cyrus V Desouza et al. J Clin Endocrinol Metab. .

Abstract

Context: Intermediate-term glycemic control metrics may represent a viable alternative to continuous glucose monitoring (CGM) in patients without access to CGM.

Objective: This work aimed to compare the relationship between CGM parameters and glycated albumin (GA), glycated hemoglobin A1c (HbA1c), and fructosamine for 24 weeks.

Methods: We conducted exploratory comparative analyses of CGM subgroup data from a previously published 24-week prospective study of assay performance in 8 US clinics. Participants included 34 individuals with type 1 (n = 18) and type 2 diabetes (n = 16) undergoing changes to improve glycemic control (n = 22; group 1) or with stable diabetes therapy (n = 12; group 2). Main outcome measures included Pearson correlations between CGM and glycemic indices and receiver operating characteristic (ROC) analysis of glycemic index values predictive of time in range (TIR) greater than 70%.

Results: At weeks 4 and 8, GA correlations with TIR were higher than HbA1c correlations in group 1. In group 2, GA correlations with TIR were statistically significant, whereas HbA1c correlations were not. In both groups over the first 12 weeks, GA correlations with TIR were higher than fructosamine-TIR correlations. In the ROC analysis, GA predicted a TIR greater than 70% during weeks 2 to 24 (area under the curve >0.80); HbA1c was predictive during weeks 12 to 24. Cutoff values for TIR greater than 70% were 17.5% (sensitivity and specificity, 0.88) for GA and 7.3% (0.86) for HbA1c.

Conclusion: GA is the most accurate predictor of TIR over 8 weeks compared with other glycemic indices, which may assist in clinical evaluation of changes in treatment where CGM is not possible and it is too early to use HbA1c (NCT02489773).

Keywords: HbA1c; continuous glucose monitoring (CGM); diabetes; fructosamine; glycated albumin.

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Figures

Figure 1.
Figure 1.
Mean rate of change in glycated albumin (GA), fructosamine (FRA), mean blood glucose (MBG), and glycated hemoglobin A1c (HbA1c) overall and in each group. Percentage changes are used so that all indices can be shown on the same scale.
See this image and copyright information in PMC

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