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The Association between Serum Hemoglobin and Renal Prognosis of IgA Nephropathy
Tae Ryom Oh1, Su Hyun Song1, Hong Sang Choi1
1Department of Internal Medicine, Chonnan National University Medical School & Hospital, Gwangju 61469, Korea.
Insights
Serum hemoglobin levels impact Immunoglobin A (IgA) nephropathy progression. Higher hemoglobin is linked to reduced risk, particularly in women, highlighting its role in chronic kidney disease prognosis.
Area of Science:
- Nephrology
- Internal Medicine
- Hematology
Background:
- Immunoglobin A (IgA) nephropathy is a leading cause of chronic kidney disease globally.
- Anemia is a frequent complication, but its specific impact on IgA nephropathy progression is understudied.
- Identifying prognostic factors is crucial for managing IgA nephropathy.
Purpose of the Study:
- To investigate the association between serum hemoglobin levels and the progression of IgA nephropathy.
- To determine if serum hemoglobin is an independent predictor of renal outcomes in IgA nephropathy patients.
Main Methods:
- Retrospective analysis of 4326 patients with biopsy-proven IgA nephropathy.
- Kaplan-Meier survival analysis, log-rank test, and Cox proportional hazards model were used.
- Primary endpoint: IgA nephropathy progression (dialysis initiation or kidney transplantation).
Main Results:
- Serum hemoglobin demonstrated a nonlinear relationship with IgA nephropathy progression.
- Each 1.0 g/dL increase in serum hemoglobin was associated with a 0.87-fold decreased risk of progression.
- Reduced serum hemoglobin was an independent risk factor for progression specifically in women.
Conclusions:
- Serum hemoglobin at diagnosis is an independent predictor of IgA nephropathy progression.
- Lower hemoglobin levels are associated with increased risk of kidney disease progression.
- Findings suggest potential therapeutic targets for improving renal prognosis in IgA nephropathy.
Abstract:
Immunoglobin A (IgA) nephropathy causes chronic kidney disease worldwide. Therefore, identifying risk factors associated with the progression of IgA nephropathy is crucial. Anemia is a common complication of chronic kidney disease; however, few studies have investigated the effect of serum hemoglobin on the renal prognosis of IgA nephropathy. This study aimed to determine the effect of serum hemoglobin on the progression of IgA nephropathy. We retrospectively analyzed 4326 patients with biopsy-proven IgA nephropathy. We evaluated the effect of serum hemoglobin on IgA nephropathy progression using Kaplan-Meier survival analyses, the log-rank test, and the Cox proportional hazards model. The primary end-point was progression of IgA nephropathy, defined as dialysis initiation or kidney transplantation. Serum hemoglobin showed a nonlinear relationship with the progression of IgA nephropathy. The Cox proportional hazards model showed that the risk of progression of IgA nephropathy decreased 0.87 times for every 1.0 g/dL increase in serum hemoglobin. In subgroup analyses, reduced serum hemoglobin was an independent risk factor for IgA nephropathy progression only in women. There was no statistically significant interaction of serum hemoglobin between men and women (P interaction = 0.177). Results of Sensitivity analysis were robust and consistent. Serum hemoglobin at diagnosis was an independent predictor for IgA nephropathy progression.
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