What is a glucose sensor?

A glucose sensor is a tiny electrode that measures your glucose levels. It sits under the skin in your interstitial fluid, where cells get oxygen and nutrients, including glucose. Glucose sensors are easily inserted using an automatic insertion device: like many types of infusion sets, a needle is used to insert the glucose sensor. The needle is then removed leaving just the tiny flexible electrode under the skin. The glucose sensor is then connected either to a transmitter so that readings can be transmitted to your insulin pump or mobile device.