Synopsis:
In this study, the Cys C level of the CIN group was significantly increased after 24 h or PCI, while the Scr level had no significant synchronic change, and the Cys C and Scr levels of the non-CIN group had no statistical significance before and after the opacification. The cut-off point value of Cys C was 1.50 mg/L, with the sensitivity and specificity as 85.7% and 82.4% respectively, suggesting that the serum Cys C concentrations had a certain value towards the early diagnosis of CIN, better than Scr, and is worthy of clinical application.