CGM features and fixes · FreeStyle Libre 2 and 2 Plus

FreeStyle Libre 2 and 2 Plus warm-up: how long it takes

Readings and alarms start 60 minutes after the sensor is started. The app sends a notification when the sensor is ready. (Abbott)

What the maker says to do

1. Wait 60 minutes after starting the sensor.
2. Use a blood glucose meter if you need a reading before then.

In the US, Abbott's Libre app replaces the FreeStyle Libre 2 app for new sensors. LibreLinkUp alert settings for Libre 2 differ by the country of the wearer's LibreView account: the US list has no No Recent Data alert.

More on the FreeStyle Libre 2 and 2 Plus

• Follower app not updating
• Signal loss
• Sensor error
• Sensor failed early
• Alarms not sounding
• Follower not getting alerts
• Compatible phones

Warm-up on other CGMs

• Dexcom G6
• Dexcom G7
• Dexcom ONE+
• Dexcom Stelo
• FreeStyle Libre 3 and 3 Plus
• Medtrum TouchCare Nano CGM
• Eversense 365
• Medtronic Simplera
• SIBIONICS GS1

Sources, quoted

• Abbott: “You'll start getting glucose readings and alarms from your Sensor in 60 minutes.”
• Abbott: “Wait until the 60 minute sensor start-up period has completed.”
• Abbott: “Use a blood glucose meter to check your glucose while you wait.”

Every quote is checked against its source page before each update of this site; last checked 2026-10-06. Makers change their apps; the source page is the authority when it differs.