Do note that all blood glucose meters get pretty inaccurate when it goes below about 4 mmol/l, depends a bit on the exact test used and varies wildly with envir

Do note that all blood glucose meters get pretty inaccurate when it goes below about 4 mmol/l, depends a bit on the exact test used and varies wildly with environmental conditions. Consider it "low" from that point onward. The meter manufacturers will tell you it's always within the ISO bounds but that is under controlled conditions with new test strips accuracy goes out the window the lower you get and the less favorable the environment is. From my personal experience with bolus is that it can vary wildly with injection site especially for slower working insulin, I used to get massive hypoglycemia from time to time with actrapid simply to injection site changes.