Glycated albumin as an improved indicator of glycemic control in hemodialysis patients with type 2 diabetes based on fasting plasma glucose and oral glucose tolerance test

Abstract

Aims To compare glycated albumin (GA) with glycated hemoglobin (HbA1c) as an indicator of glycemic control in hemodialysis patients with diabetes mellitus (DM), based on relationships with plasma glucose (PG) after overnight fasting and during 75 g oral glucose tolerance test (OGTT). Methods GA, HbA1c, plasma glucose during 75 g OGTT, and serum pentosidine were determined in DM hemodialysis patients ( n = 23, male/female 9/14). Results Significant positive correlations were found for GA and HbA1c with fasting PG (GA, r = .660, p = 0.0006; HbAlc r = 0.665, p = 0.0004), and with PG at 30, 60 and 120 min after initiation of 75 g OGTT (GA, r = 0.584, p = 0.0035; r = 0.624, p = 0.0015; r = 0.510, p = 0.0129, respectively; HbA1c, r = 0.669, p = 0.0004; r = 0.624, p = 0.0011; r = 0.509, p = 0.0112, respectively). The area under the curve for PG during 75 g OGTT showed strong correlations with GA ( r = 0.625, p = 0.0008) and HbA1c ( r = 0.671, p = 0.0003). GA and HbA1c also correlated positively with serum pentosidine, demonstrating that GA provides a no less significant assay than HbA1c as a reflection of glycemic control in DM hemodialysis patients. However, HbA1c was apparently reduced in DM hemodialysis patients, as reflected by an increase in the GA/HbA1c ratio to 3.58 ± 0.62 (mean ± SD), suggesting underestimation of glycemic control by HbA1c. Conclusion GA and HbA1c exhibited similar correlations with PG during a 75 g OGTT. The dependence of GA, in contrast to HbA1c, on PG does not differ in DM hemodialysis patients from that reported for subjects with normal renal function, suggesting GA as a better marker of glycemic control in DM hemodialysis patients.