Association of albumin, globulin and albumin/globulin ratio with renal injury in type 2 diabetic nephropathy patients

Abstract

Background Studies have shown that albumin/globulin ratio (AGR) can assess the extent of kidney damage in type 2 diabetic nephropathy (T2DN). However, there is a lack of similar clinical data to support this. Objectives This study sought to inquire into the correlation of albumin (ALB), globulin (GLB) and albumin/globulin ratio (AGR) with renal injury in patients with type 2 diabetes mellitus (T2DM). Methods A retrospective analysis was performed on the clinical data of 82 patients with T2DM (Control group) and 110 patients with type 2 diabetic nephropathy (T2DN) who were admitted to the First Affiliated Hospital of Wannan Medical College from October 2019 to April 2022. T2DN patients were classified into mild renal impairment group (n = 75) and moderate renal impairment group (n = 35) according to urinary albumin excretion rate (UAER). Then, the general data of all groups were compared. Furthermore, Pearson correlation was used to analyze the correlation of serum ALB, GLB and AGR with UAER in the three groups. A receiver operating characteristic curve (ROC) was utilized to evaluate the diagnostic value of ALB, GLB and AGR for moderate renal injury in T2DN patients. Results There were significant differences in course of disease, history of hypertension, levels of fasting plasma glucose and glycosylated hemoglobin among the three groups. Besides, compared with the Control group, the levels of ALB and AGR were lower while GLB levels were higher in the mild and moderate renal impairment group. In particular, ALB and AGR levels were lower in the moderate renal impairment group relative to the mild renal impairment group, but the GLB levels exhibited no significant difference between the two groups. According to the results of Pearson correlation analysis, a negative correlation of ALB and AGR levels with UAER was revealed in T2DN patients. ROC curves displayed the area under the curve (AUC) of ALB (0.88) and AGR (0.71) predicting moderate renal injury in T2DM patients (p < 0.05). However, GLB has no significant diagnostic value for moderate renal injury in patients with T2DN. Conclusion The course of disease, hypertension and glycemic control may affect the occurrence and development of T2DN. ALB and AGR are of high value in predicting renal injury in patients with T2DN and can serve as the foundation for the clinical diagnosis of the condition.