The gold standard for accuracy is a blood draw measurement and both finger sticks and CGMs have error margins (MARD) to that standard. Finger sticks tend to be in the range of 5-10% MARD, while the Libre has a MARD of about 9.7% over 14 days, and the Dexcom G6 has a MARD of 9% over 10 days.

You can monitor your glucose through Apple iOS and Android apps, your data is just a simple scan away.

You can use EITHER the FreeStyle Libre 2 app OR the FreeStyle Libre 2 reader to scan your sensor. The FreeStyle Libre 2 app is free and easy to use! To share glucose data and alarm notifications with others using the LibreLinkUp app,* the FreeStyle Libre 2 sensor must be paired with the FreeStyle Libre 2 app.

CGM accuracy is mainly assessed by MARD (mean absolute relative difference). As a reference point, the typical MARD for commercially available CGMs ranges from 10%–12%, whereas commercially available finger stick meters can achieve MARD results below 5%.

One of the biggest advantages of a glucose sensor is that they are designed to show you trends. A fingerstick alone cannot tell you if your blood glucose levels are rising or falling without multiple follow up checks.

Finger prick blood glucose readings and sensor glucose readings won't always match and in fact are likely to be different. That's because sensor glucose readings come from the interstitial fluid (ISF), a thin layer of fluid that surrounds the cells of the tissues below your skin, not from your blood.

FreeStyle Libre The FreeStyle Libre is a continuous glucose monitoring system used to check blood sugar in people with diabetes. It is comprised of a waterproof sensor that is worn on the back of the arm and a separate reader that records the glucose levels. The sensor is worn for 14 days and then replaced.

The app does not require a Wi-Fi or a mobile data connection to scan your Sensor or to record your current glucose readings. During periods when your phone is operating in a disconnected state, your data will only be uploaded to LibreView after a Wi-Fi or mobile data connection is restored.

Until now, people who used the Libre 2 had to scan a device (either with a smartphone or the FreeStyle Libre 2 reader) over the sensor to read glucose levels. But the sensors will now have real-time CGM capability, whereby glucose levels show up on your smartphone automatically, transmitted by Bluetooth.

No, with the FreeStyle Libre 3 system you do not need to scan to receive a glucose reading. When your FreeStyle Libre 3 sensor is paired with your smartphone, you will automatically‡ see the latest glucose information after you ...

If glucose levels are rising or falling, then the two readings may be different. This is completely normal and to be expected, particularly after meals, after taking insulin or when you´ve been exercising. When your glucose levels are stable then the two readings may be very similar.

Unlike finger stick tests where the glucose levels are measured in capillary blood, CGM devices measure it in the interstitial fluid.