After several years with a diabetic cat, I recently bought a monitor (Relione ultima) to conduct home tests. Over the past month my cats insulin dosage has increased from 3.5 (where it has been for the past year and half) to 6.5 units twice a day and I wanted to more closely monitor her levels. After having a curve done at the vet today, I took reading right before I feed her (12 hours from her morning feed) which the vet said should be less than 200 mg/l and I'm getting really high readings 450-500 mg/l. I tried the test 4 times with the same result. I recalibrated the meter and checked the experation on the strips, all appears normal. Should I take this meter back to the store and try another? Not sure what to do. Thanks for any advice.