Methods Contents of urinary cystatin C (with ELISA)、 urinary β 2-m and α 1-m(with RIA)、 urinary creatinine (with Jaffe’s method) and cystatin C creatinine ratio were determined in 98 controls, 77 subjects with low urinary β 2-m(<1mg/L), 75 subjects with high urinary β 2-m and 66 patients with chronic renal failive.

Protein-to-creatinine ratio in spot urine samples as a predictor of quantitation of proteinuria;