More now than ever, Diabetic patients have started to follow continuous glucose monitoring (CGM) in order to get a more complete picture of their glucose levels, and thus allowing patients to opt for a better treatment and better glucose control. Instead of taking glucose readings from the blood, tiny glucose sensors enter the tissue fluid to take an accurate reading of glucose. It makes logical sense to also test this site since once the glucose leaves the blood vessels and capillaries it enters the interstitial fluid (also known as tissue fluid). Blood sugar sensors can alert users before they reach their glucose limits. Doctors recommend CGM sensors with fingersticks for optimal glucose accuracy. All orders over $99 receive FREE shipping. If you have any questions please feel free to contact us toll free at 877-977-7709, we are open Mon-Fri 9-5 EST.