An older cat with several competing explanations

An older cat has lost weight while remaining interested in food, and the owner has noticed larger urine clumps in the litter tray. A previous screening panel contained an increased renal marker, but hydration and the urine results were not considered together. The owner assumes that one abnormal number means there can be only one disease. The cat is also anxious during travel and becomes distressed when handled for too long. The veterinarian needs to organize a low-stress assessment, clarify the history and choose investigations that distinguish possible endocrine, renal and other contributors. No treatment has yet been selected, and the owner asks for a plan that explains what will be learned at each stage rather than a guaranteed diagnosis from the first result.