"LO" indicates a glucose reading lower than 40 mg/dL.
"HI" indicates a glucose reading higher than 500 mg/dL.
If either of these readings are seen while using your FreeStyle LibreLink app* you should check your blood glucose with a fingerstick. If you get a second LO or HI result, contact your health care professional immediately.
* The FreeStyle Libre systems apps are only compatible with certain mobile devices and operating systems. Please check the Support section of our website for more information about device compatibility before using the apps. Use of the FreeStyle Libre systems apps may require registration with LibreView.