A plasma calcium-phosphorus product can be used to predict the lifespan of dogs with chronic kidney disease.

A serum calcium-phosphorus (sCaPP) product was assessed for prediction of survival in dogs affected with chronic kidney disease (CKD). Dogs (N = 150) were retrospectively studied and followed up to determine their lifespan using 25 healthy dogs as controls. Blood and urine analyses were performed and blood pressure was measured. The dogs were divided into groups according to sCaPP (higher or lower than 70 mg(2)/dL(2)) and International Renal Interest Society (IRIS) stage (IRIS 1-4). Shorter survival was observed with sCaPP > 70 mg(2)/dL(2) compared to dogs with sCaPP < 70 mg(2)/dL(2) [45.48 days (range: 5.8 to 149 days) versus 505.40 days (range: 113.31 to 539.52 days), mean (95% confidence interval); P