Azotemia is defined as the biochemical abnormality characterized by an elevation of nitrogenous waste products (specifically urea and creatinine) within the blood. It is the primary laboratory marker used to identify kidney dysfunction. The term is derived from the root "azot" meaning nitrogen and "emia" meaning blood condition. In clinical practice, azotemia is categorized into three distinct forms based on the origin of the problem. Pre-renal azotemia is caused by reduced blood flow to the kidneys (often due to dehydration). Renal azotemia is caused by intrinsic damage to the kidney tissue itself (true CKD). Post-renal azotemia is caused by an obstruction of urine flow (such as a ureteral stone). It is critical for the caregiver to distinguish azotemia from uremia. Azotemia refers strictly to the elevated numbers seen on the pathology report. Uremia refers to the clinical syndrome of illness (nausea, lethargy) that results from those elevated toxins.
Disclaimer: This content is for educational purposes only and does not constitute veterinary medical advice. Always consult with your primary care veterinarian or a veterinary internal medicine specialist regarding your cat’s specific condition.