There is a combined diagnostic process for
kidney disease. This includes BUN, creatinine, phosphorus, calcium and potassium levels in blood. Specific gravity and protein leakage (and any UTIs) in urine testing. Blood pressure check. Ideally, a scan and xrays of the kidneys.If possible, an SDMA (Idexx Labs) test should be done as well. Collectively, these are the indicators for kidney disease, although only some of them being abnormal would point to early disease.