Hi - This is a great question. While I personally don't own a CGM, I was able to find this link which may answer your question: https://type2diabetes.com/clinical/calibrate-cgm. Another important point from that article, is that it mentions a finger stick and a CGM measure two different things. Finger sticks are a measure of blood glucose, and a CGM measures interstitial fluid. Are you trying to compare the two to find an accurate reading? You can also find more information about why these readings may be different here: https://type2diabetes.com/living/continuous-glucose-monitor. - Cody (Team Member)