Hi everyone. I'll try to keep this short. I've just made the conclusion that I was using a bad insulin vial which I realize is very unusual. I am using novorapid and had unexplained high blood sugar levels for a few days. Firstly I put it down to stress, then I changed my cannula, then the reservoir itself. I then decided to increase my overall basal rates by 25% and I was still getting high blood sugar. By this stage, I was getting really stressed out which can't have helped matters. Finally, in desperation really, I started using a new insulin vial (same batch I think) and my blood sugar levels became much more normal. I've been a diabetic for six years and been on a pump for about six months. I've had maybe two longish periods that were similar to this one where my blood sugar levels were difficult to control and I'm wondering whether bad insulin could have explained those times as well. In future, when I start to notice a pattern of high blood sugar levels, I think I will definitely consider bad insulin as a possibility. For the record, the insulin was having an effect but was not nearly as effective as it should have been.