A glucose sensor can lower A1c in diabetes care, even without insulin
☕ Includes a question for the family ↓
Tools for living with diabetesPart of a story we are following · 3 articles · See every update
If you have type 2 diabetes and don’t take insulin, a small glucose sensor on your arm may be a real help in your diabetes care. In a new trial, people who wore one brought their blood sugar down much more than people who got usual care.
That is good news, because most people with type 2 diabetes don’t use insulin, and sensors were mostly built for people who do. Now there is solid evidence that a sensor can pay off for you too.
How the study worked
The trial ran at 22 primary care practices in the United States. Adults with type 2 diabetes who weren’t using insulin were randomly assigned to wear a continuous glucose monitor (145 people) or to get routine care (138 people). They were between 21 and 84 years old, and the trial lasted 26 weeks. It was published Oct. 14, 2026, in the New England Journal of Medicine. A sensor maker paid for it, and people knew whether they were wearing one.
A continuous glucose monitor, or CGM, is a small sensor worn on the arm or belly. It reads your blood sugar around the clock and sends it to your phone.
What they found
The main measure was A1c, a blood test that shows your average blood sugar over the past few months. Lower is better.
| A1c | Sensor group | Routine care group |
|---|---|---|
| At the start | 8.8% | 8.7% |
| After 26 weeks | 7.2% | 8.0% |
The gap between the two groups was about 1 percentage point in favor of the sensor. The exact figure was 0.9 percentage points.
People with the sensor also spent more of their day in a healthy blood sugar range, between 70 and 180 mg/dL. They gained about 21 percentage points of time in that range compared with routine care.
Safety looked good too. People with the sensor spent a little less time with low blood sugar, and no one had a severe low.
Why would a sensor help?
A fingerstick shows you one moment. A sensor shows the whole story. You can watch your sugar climb after a bowl of pasta or drop after a walk around the block. Seeing it happen makes it easier to pick the habits that work for you.
What you can do today
Look up your last A1c result in your patient portal or on your lab paper. Then write this question on your next appointment list: “Could a glucose sensor help me?” Ask your insurance plan or pharmacy about coverage, since it varies.
Talk about it at home
Some people with diabetes wear a tiny sensor that shows their blood sugar on a phone all day. In this study, those people got their sugar down more than people without one. Seeing your numbers can help you make better choices.
Try it at home
Here is a question for the table: how do we know the sensor made the difference, and not just something else? Hint: think about why the researchers picked people by chance for each group.
Keep exploring
Copies this article and its questions so you can paste them into ChatGPT, Claude, Gemini or the AI you use, and keep the conversation going.
Questions and answers
- What is a continuous glucose monitor?
- It is a small sensor worn on the arm or belly that reads your blood sugar all day and shows it on a phone or reader.
- Does a sensor help if I don't use insulin?
- In this trial, A1c fell from 8.8% to 7.2% with a sensor, compared with 8.7% to 8.0% with routine care.
- Is a glucose sensor safe?
- No severe low blood sugar events were reported, and people with the sensor spent a little less time with low blood sugar.
- How long did the study last?
- The trial lasted 26 weeks and included adults ages 21 to 84 at 22 US primary care practices.
