CGM features and fixes · Dexcom G7

Dexcom G7 warm-up: how long it takes

G7 (10-day) warm-up takes up to 30 minutes. G7 15 Day warm-up takes 60 minutes. Use your meter for treatment decisions during warm-up. (Dexcom; Dexcom user guide, p. 12)

What the maker says to do

1. Wait up to 30 minutes (G7) or 60 minutes (G7 15 Day) for the first reading.
2. Use your meter for treatment decisions until a number and trend arrow appear.

More on the Dexcom G7

• 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 G6
• 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: “Dexcom G7 can complete warmup within 30 minutes, whereas other CGM brands require up to an hour or longer.”
• Dexcom: “Dexcom G7 15 Day uses a new algorithm that allows for 5 additional days of wear, currently requiring a 60-minute warm-up.”
• Dexcom user guide, p. 12: “Use your BG meter to make treatment decisions when your Dexcom G7 15 Day CGM System doesn't show both a number and trend arrow as well as during the 60-minute sensor warmup period.”

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.