Dexcom Stelo Review: Accuracy, Cost, and Wear Time
The Dexcom Stelo is a 15-day real-time cgm continuous glucose monitor with a 9% MARD accuracy rating and a GlucoseIntel score of 4.3/5.0. The Dexcom Stelo is the first over-the-counter CGM from Dexcom, FDA-cleared in March 2024 for adults 18 and older who do not use insulin. It provides 15 days of real-time glucose data through the Stelo app without a prescription, targeting metabolic health optimization, weight management, and prediabetes monitoring at $49–$99 per month.
The Dexcom Stelo is available over the counter without a prescription, making it accessible to anyone 18 and older who wants to monitor their glucose patterns. At $49–$99 per month, it is purchased directly by consumers and is not covered by insurance or Medicare. This device is designed for wellness monitoring, metabolic health optimization, and prediabetes awareness — not for managing insulin-dependent diabetes or making insulin dosing decisions.
Released in 2024 by Dexcom, Inc. (San Diego, California), the Dexcom Stelo uses electrochemical (glucose oxidase) technology to measure glucose in interstitial fluid. It is factory-calibrated and requires no fingerstick confirmations during use. The warmup period after sensor insertion is 30 minutes, one of the fastest in the CGM market.
Dexcom Stelo
by Dexcom
Key Specifications
| Product | MARD | Wear Time | Type | Rx? | With Insurance | Without Insurance | Medicare | Rating |
|---|---|---|---|---|---|---|---|---|
| Dexcom Stelo | 9% | 15 days | Real time CGM | No | N/A — OTC product not covered by insurance | $49–$99 per month | — | 4.3 |
Sensor Type
Electrochemical (glucose oxidase)
Water Resistance
IP68 — waterproof up to 1 meter for 30 minutes
Age Approval
18 years and older
Transmitter Life
Integrated into sensor (no separate transmitter)
How Accurate Is the Dexcom Stelo?
The Dexcom Stelo has a Mean Absolute Relative Difference (MARD) of 9%, which measures the average percentage error between CGM readings and simultaneous laboratory blood glucose measurements. A lower MARD indicates higher accuracy. For context, the most accurate consumer CGM in 2026 is the FreeStyle Libre 3 Plus at 7.9% MARD, while the industry range spans from 7.9% to approximately 9.2% among FDA-cleared devices.
A 9% MARD places the Dexcom Stelo in the middle of the accuracy spectrum for current-generation CGMs. This accuracy level is suitable for glucose trend monitoring, meal response tracking, and general diabetes management. Readings may occasionally differ from a simultaneous fingerstick by 10-15 mg/dL, which is clinically acceptable for most monitoring purposes but warrants attention when making insulin correction doses.
Accuracy is highest during stable glucose periods and lowest during rapid rates of change — such as the first 60 to 90 minutes after a high-carbohydrate meal or during intense physical exercise. The physiological lag between interstitial fluid glucose (where the sensor measures) and blood glucose (what a fingerstick shows) is typically 5 to 15 minutes. Learn more about how MARD is calculated and what it means for your daily monitoring on our MARD glossary page.
What Does the Dexcom Stelo Cost?
With insurance, the Dexcom Stelo costs N/A — OTC product not covered by insurance. Without insurance, the price is $49–$99 per month. The Dexcom Stelo is not currently covered by Medicare.
The annual cost of the Dexcom Stelo depends on sensor replacement frequency. With a 15-day sensor life, users need approximately 25 sensors per year. The longer sensor life reduces annual replacement costs compared to 7-day and 10-day sensors, which require 52 and 37 sensors per year respectively.
For a complete breakdown of CGM costs across all devices, including manufacturer discount programs and patient assistance options, see our comprehensive CGM cost guide.
Sensor Wear Time: 15 Days
The Dexcom Stelo sensor lasts 15 days before requiring replacement. This 15-day wear time is among the longest for adhesive-patch CGMs, requiring only 25 sensor changes per year. Each sensor change involves removing the old sensor, inserting a new one, and waiting 30 minutes for warmup before glucose data resumes.
The 30-minute warmup is the fastest in the CGM market, minimizing the data gap between sensor changes. This is particularly valuable for patients who depend on continuous glucose data for insulin dosing or overnight monitoring.
App and Data Sharing
The Dexcom Stelo pairs with a dedicated smartphone app that displays real-time glucose values, trend arrows, and historical data. Data sharing with caregivers or healthcare providers is not available on this device. This device does not include real-time glucose alerts or alarms — it provides glucose data for awareness and trend tracking only.
Pros and Cons
Pros
- First Dexcom over-the-counter CGM — no prescription needed
- 15-day sensor wear time for convenient 2-sensor months
- Affordable entry point at $49–$99 per month
- Stelo app tracks glucose patterns, food responses, and exercise impact
- No fingerstick calibration required
- Accessible to non-diabetic users for metabolic health optimization
Cons
- No real-time alerts or alarms — not suitable for insulin-dependent diabetes management
- No insulin pump integration
- No data sharing with caregivers or healthcare providers through the app
- Not covered by insurance or Medicare
- Slightly higher MARD (9.0%) compared to the prescription G7 (8.2%)
- Not FDA-cleared for diabetes treatment decisions
Who Should Use the Dexcom Stelo?
The Dexcom Stelo is designed for adults 18 and older who want continuous glucose monitoring without a prescription. This includes people with prediabetes who want to detect insulin resistance early, wellness-focused individuals optimizing their metabolic health, athletes tracking glucose during training, and anyone curious about how food, exercise, and sleep affect blood sugar. The Dexcom Stelo is not appropriate for insulin-dependent diabetes management because it lacks the real-time alerts, pump integration, and clinical-grade features required for safe insulin dosing.
How Does the Dexcom Stelo Compare?
See how the Dexcom Stelo stacks up against competing continuous glucose monitors in our head-to-head comparison guides. Each comparison evaluates accuracy, wear time, cost, features, and which device is better for specific use cases.
Dexcom Stelo
by Dexcom