Table 1.

New Definition of CI‐AKI Using Both sCr and sCyC

Group	Definition	Risk Stratification
Group 1	No CI‐AKI: sCr increase <0.3 mg/dL and 50% from baseline; and sCyC increase <15% from baseline.	No risk
Group 2	CI‐AKI detected by a single marker: fulfill only 1 of criteria as below: (1) sCr increase ≥0.3 mg/dL or 50% from baseline; (2) sCyC increase ≥15% from baseline.	Potential risk
Group 3	CI‐AKI detected by both markers: sCr increase ≥0.3 mg/dL or 50% from baseline; and sCyC increase ≥15% from baseline.	High risk

CI‐AKI indicates contrast‐induced acute kidney injury; sCr, serum creatinine; sCyC, serum cystatin C.