Do not ignore symptoms that may be due to low or high blood glucose. If you have symptoms that do not match the Sensor glucose reading or suspect that your reading may be inaccurate, check the reading by conducting a finger stick test using a blood glucose meter. If you are experiencing symptoms that are not consistent with your glucose readings, consult your health care professional.
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What does HI mean when it appears after scanning the reader over the Sensor?

If HI appears on the Reader when users scan over the Sensor it means the reading is higher than 500 mg/dL.  Users can touch the message button for more information. Users should check their blood glucose on their fingertip with a test strip. If users get a second HI they should contact their healthcare professional immediately.1

Reference

1. FreeStyle Libre flash glucose monitoring system User's Manual.

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