Serum phosphorus concentrations were measured in 155 dogs with leishmaniosis at different stages of chronic kidney disease (CKD), and in 54 healthy dogs. CKD was classified into six stages, as follows: stage 0 (dogs with no evidence of CKD), serum creatinine (SCr) less than 125 μmol/l and urine protein:creatinine ratio (UPC) less than 0.2; stage 1A, SCr less than 125 μmol/l and UPC 0.2 to 0.5; stage 1B, SCr less than 125 μmol/l and UPC over 0.5; stage 2, SCr 125 μmol/l to 180 μmol/l; stage 3, SCr 181 μmol/l to 440 μmol/l; stage 4, SCr over 440 μmol/l. The dogs' serum phosphorus concentrations correlated significantly with the severity of CKD (P<0.001), and hyperphosphataemia (>1.8 mmol/l) affected 12 per cent, 11.8 per cent, 50 per cent, 76.9 per cent and 100 per cent of the dogs at stages 1A, 1B, 2, 3 and 4, respectively.
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