What is a CGM?
Tia avatar
Written by Tia
Updated over a week ago

A Continuous Glucose Monitor (CGM) is a small device worn on the back of the upper arm. The sensor has a thin, flexible filament that measures the amount of glucose in the interstitial fluid of the body. It collects your glucose levels in 15-minute increments over 14 days.

There are three versions of the Libre sensor compatible with Veri. If you are wearing a Libre 1 or Libre 2 sensor, you must use your phone to manually scan the sensor at least once every 8 hours. This is because the glucose data is stored locally and has a memory span of only eight hours. If you go longer than 8 hours between scans, the oldest data is erased and replaced with the newest data resulting in a gap in the glucose data collection.

If you are wearing a Libre3 sensor, scanning is not necessary as the data is automatically transferred from the CGM to the phone via Bluetooth. For the data to transfer, the cell phone must have Bluetooth turned on and the phone must remain near the sensor with the Libre3 app open.


While the sensor is water resistant, it should always be used according to its directions and labeling.

Did this answer your question?