TABLE 2.

International Renal Interest Society chronic kidney disease staging before radioiodine treatment with serum creatinine and SDMA concentrations

IRIS CKD stage		Based on serum creatinine
		0	1	2	Total
Based on serum SDMA	0	60	…	…	60
	1	…	12	0	12
	2	…	2	1	3
	4	…	2	0	2
	Missing	1	2	0	3
	Total	61	18	1	80

Note: International Renal Interest Society CKD staging (0–4) according to the creatinine (columns) and SDMA (rows) concentrations. The allocation of stage 0 is given to cats with adequate urine concentration (urine specific gravity ≥1.035) and deemed to have adequate renal function. The allocation of possible stage 1 is given to cats with urine specific gravity <1.035, but with creatinine <140 μmol/L and/or SDMA <18 μg/dL. Bolded numbers indicate agreement between serum creatinine and SDMA.

Abbreviations: CKD, chronic kidney disease; SDMA, symmetric dimethylarginine.