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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