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The prognostic importance of severity and type of post‐transplant proteinuria

Proteinuria, developing after renal transplantation may influence allograft and patient outcomes. This study aimed to investigate the effect of proteinuria on patient and allograft survival. Among 514 patients, 56 (11%) patients with good allograft function and proteinuria were evaluated retrospectively. Patients with proteinuria were classified as group P (20 patients with permanent proteinuria, Male/Female: 16/4) and group T (36 patients with temporary proteinuria, M/F: 29/7) according to the type of proteinuria. Also, considering the amount of proteinuria, patients were classified as group M (32 patients with massive proteinuria, M/F: 29/3) and group NM (24 patients with non‐massive proteinuria, M/F: 16/8). The mean time interval between transplantation and appearance of proteinuria was 23.7 months (range 0–121 months) and no difference was found between groups. Two‐ and 5‐yr allograft survival rates were found to be 85 and 80% in group M, and 95 and 82% in group NM, respectively (p=0.24). In terms of type of proteinuria, 2‐ and 5‐yr allograft survival rates were found to be 70 and 58% in group P and 92 and 87% in group T, respectively. The difference between groups P and T was found to be statistically significant (p=0.02). Most (85%) of the patients with permanent proteinuria also had massive proteinuria. In conclusion, we found a significant relation between type and severity of proteinuria. The type of post‐transplant proteinuria had a stronger effect on allograft outcome than the severity of proteinuria.