How To Switch From Dexcom G6 To G7 Step By Step? Key Facts

Switching from the Dexcom G6 to the Dexcom G7 is mostly a matter of getting a new prescription and setting up a new sensor. The G7 is a different device with a different app, a different transmitter design, and a shorter warm-up period, so you do not simply swap one sensor for another the way you would replace a battery. You finish your current G6 sensor session, stop using the G6 receiver or app, and start fresh with the G7 system.

That sounds simple, and for many people it is. But there are real differences between the two systems that affect how you manage your diabetes day to day. Knowing those differences before you switch can save you a confusing first week.

How To Switch From Dexcom G6 To G7 Step By Step

The switch happens in stages, and the order matters less than making sure each stage is complete before you rely on the new device for treatment decisions.

Step 1: Talk to your prescriber. The G7 requires its own prescription. Your clinician needs to write a new order specifying the G7 system, including sensors and any receiver you plan to use. Your pharmacy or durable medical equipment supplier cannot substitute the G7 for a G6 order on its own.

Step 2: Check coverage before you commit. Insurance coverage for the G7 varies by plan and has changed over time as the device has become more widely adopted. Call your insurer or supplier and confirm what is covered, what your out-of-pocket cost will be, and whether you need prior authorization. Doing this before your last G6 sensor runs out avoids a gap in coverage.

Step 3: Download the G7 app. The G7 uses its own app, separate from the G6 app. If you use a receiver, the G7 has a different receiver as well. The G6 app and G7 app can be installed on the same phone, but they will not share data with each other.

Step 4: Finish your current G6 sensor. You do not need to remove a working G6 sensor early. Let it complete its session, then remove it. There is no need to overlap the two systems, and running both at once can create confusing duplicate data in your reports.

Step 5: Insert and start the G7 sensor. Insert the G7 sensor according to the instructions that come with it, then start the session in the app or receiver. The G7 has a shorter warm-up period than the G6. Dexcom states the G7 warm-up is 30 minutes, compared with 2 hours for the G6, though you should confirm current specifications in the product instructions since device details can be updated.

Step 6: Confirm your alerts and sharing settings. Your alert thresholds and sharing followers do not transfer automatically. You will need to set them up again in the G7 app. Do this before your first night, not after.

Step 7: Tell anyone who follows your data. If a family member or caregiver follows your glucose readings, they will need a new invitation from the G7 app. The old G6 sharing connection will not carry over.

What Actually Changes Between the G6 and the G7?

The two systems measure glucose the same way — through a small sensor wire placed under the skin that reads glucose in the fluid between cells. The differences are in design, wear time, and how the data reaches you.

The G6 comes in two parts: a sensor and a separate reusable transmitter that snaps into it. The G7 combines the sensor and transmitter into a single disposable unit. That means no transmitter to charge, clean, or keep track of — but also no reusable component, so each sensor is discarded entirely when the session ends.

Warm-up time is shorter on the G7. The G6 requires a 2-hour warm-up before it begins reporting readings. Dexcom states the G7 warm-up is 30 minutes. A shorter warm-up means less time without data when you start a new sensor.

Wear time differs as well. The G6 sensor is approved for 10 days of use. The G7 sensor is also approved for 10 days in the United States, though Dexcom has extended wear time in some other markets. Always follow the wear time stated in the instructions for the product you actually have.

One detail people notice quickly: the G7 does not require the fingerstick calibration that the G6 sometimes does. The G6 is factory-calibrated and generally does not require fingersticks, but it does allow optional calibration. The G7 is also factory-calibrated. Neither system removes the need to confirm with a fingerstick when a reading does not match how you feel, or when your device tells you to.

Does the G7 Work With the Same Devices and Pumps?

This is where many people hit a snag. The G7 is not automatically compatible with every insulin pump, automated insulin delivery system, or third-party app that worked with the G6.

Compatibility depends on the specific pump or system and its software version. Some systems gained G7 compatibility through software updates. Others required a new pump or a different integration. The list of compatible devices has expanded over time, so a compatibility gap that existed a year ago may no longer apply.

Before you switch, check directly with the maker of your pump or automated insulin delivery system, and with Dexcom, about whether your specific device and software version support the G7. Do not assume compatibility because the same company makes both products.

If you use a third-party app to display or analyze your glucose data, check whether it supports the G7 as well. Many do now, but support was not universal at launch.

What Should You Watch For in the First Week?

Sensor glucose readings come from fluid under the skin, not from blood. That fluid lags behind blood glucose, especially when your glucose is changing quickly. This lag exists with both the G6 and G7, but it can feel more noticeable when you are getting used to a new device.

Expect some difference between the new sensor and how you feel, particularly on day one and during rapid changes. This is normal and not a sign the device is faulty. Do not make treatment decisions based on a sensor reading that conflicts with your symptoms — confirm with a fingerstick.

Insertion sites matter. The G7 has different approved insertion sites than the G6, so read the instructions rather than placing it where you used to place the G6. The back of the upper arm is a common approved site for the G7, but confirm the approved locations for your specific product.

If readings seem consistently off after the first day, contact Dexcom support or your clinician rather than adjusting your own insulin doses to match a sensor you do not trust.

Can You Use Up Your Remaining G6 Supplies First?

Yes, and many people do. There is no requirement to abandon unopened G6 sensors and transmitters when you receive a G7 prescription. Using remaining supplies first avoids waste and gives you time to set up the new system without pressure.

One practical note: G6 transmitters have a fixed lifespan once activated, and sensors have expiration dates. Check your supplies so you do not end up with a transmitter that expires before you can use the sensors that go with it.

If you are switching because of a coverage change or a supplier decision rather than your own choice, ask your supplier what happens to any G6 supplies you still have. Policies vary.

Is the G7 More Accurate Than the G6?

Both systems are approved by the FDA for making diabetes treatment decisions without a confirmatory fingerstick, which is a meaningful regulatory standard. That approval reflects that each device met accuracy requirements in the studies submitted for review.

Head-to-head comparisons between the two are limited, and accuracy in real-world use depends on many factors — insertion site, your body, how stable your glucose is, and how the sensor is worn. Neither device is universally more accurate for every person.

What matters more than the label on the box is whether the device works reliably for you. If you switch and find the G7 reads consistently well for your body, that is the relevant measure. If it does not, that is worth discussing with your clinician rather than assuming all sensors behave the same way.