Can anyone tell when and what my nadir is? +4, +5, +6? It seems to be all over the place. I seem to have a lot of inter-day variablility. Does this ever get more understandable or more obvious? Isn't this the number you look at to determine the insulin dose? I'm trying to determine if I should increase to 1.5 units. My vet said it would be okay but I am concerned. I am a Vetsulin user currently at 1.25 units and I use a ReliOn Prime meter.