Healthy Glucose Level For Cats. Diabetic cats often have levels over 400, or even 600 mg/dl. A urine sample is analysed to check for glucose, often using a dipstick.

To know when your cat’s glucose levels are rising, it will show symptoms like vomiting, loss of appetite, weakness, and excessive thirst. A sample of blood is taken to check the level of blood glucose. A handheld glucometer is one way to monitor these levels.