Table 2.

Serum CysC (sCysC) and urinary cystatin C to creatinine ratio (uCysC/uCr) measured met the nephelometric assay in the healthy cats and cats with CKD for each IRIS stage. Data are presented as mean ± SD. n represents number of cats

Status	sCysC (mg/L)	uCysC/uCr (mg/mol)
Healthy (n = 41)	1.0 ± 0.28	0.32 ± 0.95
CKD IRIS stage 1 (n = 1)	1.065	7.40
CKD IRIS stage 2 (n = 17)	1.26 ± 0.40	123.62 ± 374.4
CKD IRIS stage 3 (n = 11)	1.50 ± 0.50	254.0 ± 206.0
CKD IRIS stage 4 (n = 15)	1.67 ± 0.57	526.80 ± 489.87

CKD, chronic kidney disease; IRIS, international renal interest society; SD, standard deviation LOD, limit of detection.