Can anyone give me an idea how long glucose levels usually stay high after an illness? My daughter had just got herself sorted with adjusted basal rates after her clinic appointment last Monday and her readings were good when.... Wham! she got a really heavy cold on Thursday and went up high. We have been compensating ever since, but I thought she should be returning to normal now. She still has a nasty cough, but is loads better. I am beginning to wonder if she is going to stay high now and we are going to have to adjust her doses all over again? Is that likely? Just when I think we are getting the hang of it, along comes another challenge!