An elevated blood phosphate level (hyperphosphataemiaIncreased phosphate in the blood.) also indicates the presence of CKD, as the chronically damaged kidneys can excrete less phosphate. However, other factors can also influence phosphate levels, for instance the meat content of food and time of last meal. In addition, phosphate levels in young cats are always higher. In isolation, an elevated phosphate level is as inconclusive as an isolated elevated ureaUrea is the nitrogen-containing breakdown product of protein metabolism. The nitrogen from the proteins is converted to ammonia in the liver, which is combined with carbon dioxide to form urea. This is continuously excreted via the kidneys but also via sweat. Urea is one of... level. Only a combination of elevated creatinineCreatinine is a breakdown product of muscle metabolism. Its blood level is dependent, among many factors, on age, weight, nutritional status and muscle mass. Hence, creatinine levels in the blood vary from individual to individual. Creatinine is continuously excreted in the urine. Increased blood creatinine..., urea and phosphate blood levels indicates the presence of CKD.
Further tests, such as urine analyses, then need to be carried out for verification. In the context of CKD management, phosphate levels provide a good indication of whether phosphate-reduced therapy has been effective.
Phosphate concentrations should be below 1.9 mmol/l, otherwise an appropriate phosphate-reducing therapy should be undertaken. The normal phosphate range is approximately 0.8–1.9 mmol/l.
Blood phosphate should be below 1.9 mmol/l.