Table 1.

Total serum magnesium concentrations and magnesium abnormalities of cats with International Renal Interest Society (IRIS) stage 1–4 chronic kidney disease (CKD) and nephrolithiasis

CKD cats with nephrolithiasis	IRIS 1 (n = 7)	IRIS 2 (n = 10)	IRIS 3 (n = 15)	IRIS 4 (n = 10)
Mean ± SD (range) total serum magnesium concentrations (mg/dl)	1.94 ± 0.32 (1.60–2.56)*	1.72 ± 0.32 (1.27–2.32) †	1.98 ± 0.31 (1.33–2.39) ‡	2.90 ± 1.14 (0.91–4.50) ‡
Magnesium abnormalities	0/7 (0%) hypomagnesemia 2/7 (28%) hypermagnesemia	3/10 (30%) hypomagnesemia 2/10 (20%) hypermagnesemia	2/15 (13%) hypomagnesemia 5/15 (33%) hypermagnesemia	1/10 (10%) hypomagnesemia 8/10 (80%) hypermagnesemia

^*P <0.05

^†P <0.001

^‡P <0.01