My 15 year old female cat was diagnosed with diabetes in November of 2017. She went in to get a growth on her back checked out, as well as some mild mouth sores, when the diabetes was discovered. The vet tested a level of 380 and put her on 2 units twice daily of ProZinc, along with prescription diabetic food. Until Christmas, she seemed to be doing fine. She had a vet checkup between diagnosis and the holidays of 91. At Christmas, we unfortunately had to board her at the vet for 4 days. Since then, she has had a very rough time becoming regulated. I started home testing with a Relion Micro and the readings seem to bounce up and down so much. Yesterday I tested her 4 times and the vet tested once. I had a +5 hours from first shot of 71, a +7 of 81, the vet tested her at 186, a test right before her second dose of the day at 279 and then a final test of 199 at 4 hours after the second shot. The vet was going to increase her dose to 3 units, but the number of 186 made him go back on that. Today I've tested her twice. Once before her first shot, before eating, and got 450. And just now, 3 hours after her second shot, and got 494. I don't know what to do with these numbers. Is the Micro not reliable? I don't know how she could go from below renal threshold yesterday to so high today. I'm not sure what to trust - the vet or the meter. Another note: the vet did get her an antibiotic because he thought she might have a urinary tract infection. She has had a problem since just before diagnosis of drinking a lot of water and urinating a lot. She still is, which could either be the UTI or that she is above renal threshold. I just don't know. I'm not really sure what I'm even asking here. I just don't know how or why she can be "fine" one day and so high the next. It could be the meter, but she is still urinating huge puddles and drinking a lot of water. Otherwise she's acting fine. Obviously, my thought is that her kidneys are going bad and that's causing her stress, but the vet didn't want to go there yet. It's so bizarre to go from fine to not-fine in 12-18 hours. I'm supposed to go back in on Monday or Tuesday and I think I'm going to insist on a fructosamine curve so I'll know for sure if my meter is off. Anyway, thanks for reading. If anyone has any advice or knowledge, I'd be grateful to listen. Thank you!