Hyperglycemia is defined as an abnormally high level of glucose (sugar) circulating in the bloodstream. In the feline patient, interpreting this result requires significant caution due to a common phenomenon known as "Stress Hyperglycemia." Unlike humans, cats release a massive surge of adrenaline when frightened (such as during a veterinary exam), which causes a temporary, sharp spike in blood sugar that can mimic Diabetes. For the Chronic Kidney Disease (CKD) caregiver, distinguishing between temporary stress and true disease is vital. If the hyperglycemia is sustained (due to Diabetes Mellitus), it becomes a major threat to the kidneys. The excess sugar spills into the urine and creates a condition called osmotic diuresis, where the sugar acts like a sponge, pulling water out of the body. This accelerates dehydration, which is the primary enemy of a CKD patient. To determine if the high sugar is real or just stress, veterinarians typically run a Fructosamine test, which measures the average blood sugar over the past two to three weeks rather than a single moment in time.
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.