Table 3.

Proposed interval likelihood ratios (for detection of mGFR <30.8 mL/min/L)

Biomarker	Serum concentration	mGFR decreased (number of dogs)	mGFR normal (number of dogs)	Interval likelihood ratios
Creatinine μmol/L (mg/dL)	>127 (1.4)	26	1	61
	101‐127 (1.1‐1.4)	2	14	0.33
	≤100 (<1.1)	1	53	0.04
SDMA μg/dL	>16	25	1	61
	14‐16	1	8	0.29
	≤13	3	59	0.05
Cystatin C mg/L	>0.91	18	1	42
	0.47‐0.91	9	18	1.1
	≤0.46	2	49	0.14

Abbreviations: mGFR, measured glomerular filtration rate; SDMA, symmetric dimethylarginine.