CST3 and acute kidney injury: Cystatin C levels on arrival (SMD = 0.70; 95% CI: 0.37-1.03; p < 0.0001) and after 12 h (SMD = 0.38; 95% CI: 0.19-0.58; p < 0.0001) were significantly higher in AKI patients but the differences in its levels between AKI and non AKI subjects after 24 h (SMD = 0.53; 95% CI:-0.61-1.67; p = 0.36) were not statistically significant (Fig. 3 and Table 3).