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  • Title: Relationship between assays of glycemia in diabetic subjects with advanced chronic kidney disease.
    Author: Freedman BI, Shihabi ZK, Andries L, Cardona CY, Peacock TP, Byers JR, Russell GB, Stratta RJ, Bleyer AJ.
    Journal: Am J Nephrol; 2010; 31(5):375-9. PubMed ID: 20299782.
    Abstract:
    BACKGROUND: Relative to hemoglobin A(1c) (HbA(1c)), glycated albumin (GA) more accurately reflects recent glycemic control in diabetic patients on hemodialysis and peritoneal dialysis. These assays have yet to be compared in patients with advanced chronic kidney disease (CKD). METHODS: HbA(1c) and GA were simultaneously measured in 303 diabetic subjects: 70 with CKD prior to dialysis (CKD-stage 4), 184 with CKD after transplantation (TXP-stage 3) and 49 non-nephropathy controls. RESULTS: Mean estimated GFR was 76, 46 and 26 ml/min in controls, TXP-3 and CKD-4 cases, respectively. Mean (SD) HbA(1c) (%) and GA (%) concentrations were 7.30 (1.40) and 16.8 (4.9) in controls, 7.28 (1.66) and 21.5 (6.4) in CKD-4 cases, and 7.21 (1.62) and 21.2 (5.5) in TXP-3 cases, respectively. The GA:HbA(1c) ratio differed significantly between non-nephropathy controls and both groups of CKD patients (both p < 0.001), but not between CKD-4 and TXP-3 cases (p = 0.92). The glucose:HbA(1c) ratio was inversely associated with GFR in all 254 nephropathy cases (r = -0.13; p = 0.04), while glucose:GA did not vary significantly based upon GFR (r = -0.08; p = 0.24). CONCLUSIONS: The relationship between glycated albumin and HbA(1c) is influenced by the presence of reduced GFR in diabetic patients with CKD. The accuracy of the HbA(1c) assay in diabetic subjects with severe nephropathy requires further investigation, although HbA(1c) performs relatively well with milder CKD.
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