Table 4. Structural-AKI thresholds for severity stages based on equivalent sensitivity (62%) to Functional-AKI.

Functional-AKI stage	NGAL	AP	GGT	Cystatin C	IL-18	KIM1	α-GST	π-GST
	ng/ml	U/L	U/L	mg/L	pg/ml	pg/ml	μg/L	μg/L
1. ≥26.4 µmol/L in 48h or ≥50% in 7d	140	11.2	128	0.95	118	1850	5.13	14.6
2. ≥100% in 7d	438	28.2	254	7.77	735	6530	31.1	59.3
3. ≥200% or increase to ≥353.6 µmol/L in 7d	2710	50.2	452	17.0	2330	9760	82.1	141