CST3 and kidney disorder: Cut-off points were identified as 1.015 mg/dL for serum creatinine and 0.930mg/L for cystatin C. Furthermore, cystatin C based Hoek formula showed the better correlation (0.635, <i>P</i> < 0.001) with UP/UC compared with creatinine based modification of diet in renal disease (MDRD) formula.<h4>Conclusion</h4>The study showed elevated serum cystatin C in patients with persisting proteinuria compared with non-responding serum creatinine.