The Sensor is applied to the back of the upper arm with a simple, disposable device called an applicator. When the Sensor is applied, a small (5mm) filament is inserted just under the skin, and held in place with a small adhesive pad. Most patients don't feel pain when applying the Libre Sensor.^{†,^}
Also, FreeStyle Libre 3 system users have reported that the sensor is painless to wear^{^^}

* Sensor refers to the FreeStyle Libre 2, FreeStyle Libre 2 Plus, or FreeStyle Libre 3 Plus sensor

† Data on file. In a study conducted by Abbott Diabetes Care, 93.4% of patients surveyed (n=30) did not feel discomfort under the skin while wearing the Sensor.

^ The data from this study was collected using the FreeStyle Libre system. Sale of the original FreeStyle Libre system has been discontinued in Ireland market. The FreeStyle Libre 2 and 3 systems are for sale, providing the same benefits as the original FreeStyle Libre system, with the added functionalities of optional Real-Time Alarms.

^^ Alva, S. Diabetes Therapy (2023). https://doi.org/10.1007/s13300-023- 01385-6