The CGM doesn't take readings from your blood but from interstitial fluid. I have been using one for about a month now. It was very frustrating in the beginning but is getting better now that I'm a little more used to what it does. It lags behind what your finger stick will tell you but it is good to notice trends. When you are going up or down very quickly it can't quite keep up so I've dropped pretty low without it realizing and alarming me. So far I like it and am hoping it can help me get my A1C down to 6 or lower.
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