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고립성 현미경적 혈뇨 환자에서 신장 조직검사 시행 여부의 결정을 위한 요중 βig-h3의 유용성
문성진 ( Sung Jin Moon ),한승혁 ( Seung Hyeok Han ),김진주 ( Jin Ju Kim ),이금희 ( Jin Ji Li ),정동섭 ( Dong Sub Jeong ),곽승재 ( Seung Jae Kwak ),이정은 ( Jung Eun Lee ),김동기 ( Dong Ki Kim ),김현욱 ( Hyun Wook Kim ),장제현 ( Ja 대한신장학회 2007 Kidney Research and Clinical Practice Vol.26 No.6
Purpose : This study was undertaken to elucidate the usefulness of urinary βig-h3 concentrations in differential diagnosis of isolated microscopic hematuria patients. Methods : Seventy-seven patients, in whom renal biopsy was performed due to microscopic hematuria without proteinuria, were enrolled. The patients were divided into two groups, IgAN group (patients with IgA nephropathy, N=37) and NM group (patients with normal or minor change on renal biopsy, N=40), and the clinical characteristics and laboratory findings were compared between the two groups. TGF-β and βig-h3 concentrations in urine were determined by ELISA and were compared between the two groups. To establish the optimal cut-off value of βig-h3/creatinine (Cr) ratio for the diagnosis of IgA nephropathy, a receiver operating characteristic curve was constructed and the sensitivity and specificity were calculated. Results : A comparative analysis revealed no significant differences in age and sex ratio between the two groups. There were no differences in serum IgG, IgA, IgM, C3, and C4 levels between the two groups. The urinary βig-h3/Cr ratio was significantly higher in the IgAN group compared to the NM group (6.632.6 vs. 4.462.6 ng/mg, p<0.05), whereas there was no significant difference in the urinary TGF-/Cr ratio between the two groups (14.82.1 vs. 13.75.1 pg/mg, p>0.05). A cut-off βig-h3/Cr ratio 4.5 has a sensitivity of 85.0% and a specificity of 77.8%. Conclusion : The urinary βig-h3/Cr ratio was a good predictor for the diagnosis of IgA nephropathy. Therefore, renal biopsy should be considered in isolated microscopic hematuria patients with high urinary βig-h3/Cr ratio.