CGM features and fixes · Dexcom G6

Dexcom G6 warm-up: how long it takes

G6 warm-up takes 2 hours. You get no readings or alerts during warm-up, so use your meter. (Dexcom user guide, p. 38; Dexcom user guide, p. 89; Dexcom user guide, p. 87)

What the maker says to do

1. Tap Start Sensor to begin the 2-hour warm-up.
2. Use your meter for treatment decisions until readings start.

More on the Dexcom G6

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

Warm-up on other CGMs

• Dexcom G7
• Dexcom ONE+
• Dexcom Stelo
• FreeStyle Libre 2 and 2 Plus
• FreeStyle Libre 3 and 3 Plus
• Medtrum TouchCare Nano CGM
• Eversense 365
• Medtronic Simplera
• SIBIONICS GS1

Sources, quoted

• Dexcom user guide, p. 38: “You won’t get alarm/alerts or G6 readings during the 2-hour warmup or after a sensor session ends.”
• Dexcom user guide, p. 89: “Tap Start Sensor to start your 2-hour sensor warmup.”
• Dexcom user guide, p. 87: “During sensor warmup, use your meter.”

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.