# Stelo Glucose Biosensor: Complete Technical Guide and Daily Use Instructions

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Source: https://support.nutrisense.io/en_us/stelo-glucose-biosensor-complete-technical-guide-daily-use-ryLwk5CJgg

Last updated: 2026-01-06T16:49:27.166Z

Built on **_Dexcom's advanced CGM technology_**, Stelo represents a breakthrough in accessible glucose monitoring. This innovative glucose biosensor delivers reliable, continuous glucose data in an easy-to-use format designed to support your health journey without requiring a prescription.

Stelo bridges the gap between traditional blood glucose meters and prescription continuous glucose monitors, offering unprecedented access to glucose insights for individuals seeking to understand their metabolic health. Whether you're managing diabetes, prediabetes, or simply want to optimize your wellness routine, Stelo provides the data you need to make informed decisions about your health.

The device represents years of research and development in glucose monitoring technology, leveraging proven biosensor principles while maintaining the accuracy and reliability that healthcare providers and users expect from Dexcom products.

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## Included in this article:

*   [Technical Specifications](#technical-specifications)
*   [Mobile App Compatibility](#mobile-app-compatibility)
*   [Understanding Glucose Monitoring](#understanding-glucose-monitoring)
*   [Travel and Mobility](#travel-and-mobility)
*   [Daily Use and Maintenance](#daily-use-and-maintenance)

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## Technical Specifications

Stelo delivers exceptional accuracy with a **_Mean Absolute Relative Difference (MARD) of 9.2%_**, placing it among the most precise glucose monitoring devices available without a prescription. This MARD rating indicates that readings are typically within 9.2% of laboratory-grade glucose measurements.

In extensive clinical studies, Stelo demonstrated **_93% accuracy_** when compared to gold-standard laboratory blood glucose tests. This level of precision ensures that users receive reliable glucose data they can trust for making health decisions.

### Physical Design and Dimensions

Stelo's compact, discreet design ensures comfortable wear throughout your daily activities:

*   **Width:** **_24.14 mm_** - Optimized for minimal profile
*   **Length:** **_27.4 mm_** - Ergonomically designed for various body contours
*   **Height:** **_4.72 mm_** - Ultra-thin profile prevents snagging on clothing

The sensor's low-profile design minimizes interference with daily activities while maintaining the structural integrity needed for accurate glucose monitoring. Advanced materials ensure durability while remaining comfortable against the skin for extended wear periods.

### Sensor Technology

Stelo utilizes advanced electrochemical glucose oxidase technology to measure glucose levels in interstitial fluid. This proven technology provides continuous monitoring capabilities while maintaining the accuracy standards established by Dexcom's decades of CGM development.

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## Mobile App Compatibility

To ensure optimal performance and access to all Stelo features, your mobile device must meet specific operating system requirements:

#### iOS Compatibility

*   **Highest Supported OS:** **_iOS 18.3_**
*   **Minimum Required OS:** **_iOS 16.2_**

#### Android Compatibility

*   **Highest Supported OS:** **_Android 15_**
*   **Minimum Required OS:** **_Android 12_**

Maintaining your device's operating system at the latest supported version ensures the best app experience, including access to new features, security updates, and optimal sensor communication. Regular updates also help maintain reliable Bluetooth connectivity between your sensor and mobile device.

### App Features and Functionality

The Stelo mobile application provides comprehensive glucose monitoring capabilities, including real-time glucose readings, trend data, historical analysis, and personalized insights. The app's intuitive interface makes it easy to track your glucose patterns and understand how various factors affect your levels.

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## Understanding Glucose Monitoring

Understanding the distinction between glucose biosensors and traditional continuous glucose monitors (CGMs) helps clarify Stelo's unique position in the glucose monitoring landscape:

#### Traditional CGMs

*   Require a prescription from a healthcare provider
*   Typically designed for individuals with diagnosed diabetes
*   Often covered by insurance plans
*   May require calibration with blood glucose meter readings

#### Stelo Glucose Biosensor

*   **_Does not require a prescription_**
*   Accessible to anyone seeking glucose insights
*   Available for direct purchase
*   No calibration required

This accessibility makes Stelo an ideal choice for individuals with prediabetes, those interested in metabolic health optimization, or anyone curious about how their lifestyle choices affect their glucose levels.

### Accuracy and Reading Interpretation

Stelo measures glucose in **_interstitial fluid_** - the fluid between your body's cells - while traditional blood glucose meters (BGMs) measure glucose directly from blood samples. This fundamental difference explains why readings between the two methods may occasionally vary.

#### Factors Affecting Reading Accuracy

Several factors can influence the correlation between Stelo readings and blood glucose meter results:

*   **Hand cleanliness:** Residual substances on fingers can affect BGM accuracy
*   **Newly inserted sensors:** Allow 60 minutes for stabilization after sensor insertion
*   **External pressure on sensor:** Compression can temporarily affect interstitial fluid flow
*   **Rapid glucose changes:** Interstitial glucose lags behind blood glucose by 5-15 minutes
*   **Test strip quality:** Expired or improperly stored BGM strips can provide inaccurate results

### Clinical Validation

Extensive clinical studies confirm Stelo's **_93% accuracy_** compared to gold-standard laboratory blood glucose tests, making it the most accurate glucose biosensor available without a prescription. This level of accuracy provides confidence in the data you receive for making informed health decisions.

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## Travel and Mobility

Stelo's availability is currently restricted by regulatory requirements and geographic limitations:

#### Eligibility Requirements

*   Your **primary residence must be in the United States**
*   Your **Stelo app and account must be created while physically in the US**
*   Initial sensor setup and account verification must occur within US borders

#### International Use

Once your account is established and verified within the United States, you may continue using Stelo while traveling internationally. The sensor will continue to collect glucose data, and the app will function normally, though customer support may be limited while abroad.

### Airport Security and Air Travel

Stelo is designed with frequent travelers in mind, offering multiple options for navigating airport security while wearing your sensor:

#### Approved Security Procedures

Stelo sensors are safe to wear through standard airport security equipment:

*   **Walk-through metal detectors:** Stelo will not trigger alarms or affect device function
*   **Advanced Imaging Technology (AIT) body scanners:** The sensor is designed to be compatible with millimeter wave scanners

#### Alternative Security Options

If you prefer alternative screening methods or if requested by security personnel, you may request:

*   **Hand-wanding:** A manual security check using a handheld metal detector
*   **Full-body patdown:** Physical screening with visual inspection of the sensor area

When requesting alternative screening, inform security personnel that you're wearing a medical glucose monitoring device. Consider carrying documentation about Stelo to expedite the process.

### In-Flight App Usage

You can continue monitoring your glucose levels during flight by following these steps:

1.  Switch your mobile device to **_Airplane Mode_**
2.  Manually turn **_Bluetooth_** back on
3.  Ensure the Stelo app has permission to use Bluetooth while in airplane mode

**Important:** Always comply with airline policies and follow crew instructions regarding electronic device usage. Some airlines may have specific requirements during takeoff and landing that override these recommendations.

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## Daily Use and Maintenance

Stelo features robust water resistance designed to accommodate various daily activities and exercise routines:

#### Water Resistance Specifications

*   **Waterproof rating:** **_Up to 8 feet (2.4 meters) depth_**
*   **Duration:** Extended submersion periods supported
*   **Temperature:** Suitable for normal water temperatures encountered in daily activities

#### Approved Water Activities

You can safely wear Stelo during:

*   **Bathing and showering:** Normal personal hygiene routines
*   **Swimming:** Pool, ocean, or lake swimming within depth limits
*   **Water sports:** Activities like surfing, water skiing, or snorkeling
*   **Hot tubs and saunas:** Brief exposure to elevated temperatures

#### Connectivity Considerations

When engaging in water activities, keep these connectivity factors in mind:

*   Your mobile device should remain within **_20 feet (6 meters)_** when possible
*   Glucose readings may be temporarily delayed while fully submerged
*   Data will automatically sync once the sensor resurfaces and reconnects
*   Consider using waterproof phone cases for poolside or beach monitoring

### Sensor Lifespan and Performance

Understanding Stelo's wear duration helps you plan sensor replacements and maintain consistent glucose monitoring:

#### Expected Wear Time

*   **Standard duration:** **_Up to 15 days_** of continuous wear
*   **Grace period:** **_12-hour extension_** available at the end of sensor life
*   **Total possible duration:** Up to 15.5 days maximum

#### Clinical Study Results

Extensive sensor life studies provide realistic expectations for Stelo performance:

*   **_77.9%_** of sensors lasted the full 15-day duration
*   Approximately **_20%_** of sensors did not reach the full 15 days
*   **_10%_** of sensors lasted fewer than 12 days when used as directed

#### Factors Affecting Sensor Life

Several factors can influence how long your sensor remains functional:

*   **Individual skin characteristics:** pH levels, moisture, and sensitivity
*   **Activity level:** High-impact activities may affect adhesion
*   **Environmental conditions:** Extreme temperatures or humidity
*   **Application technique:** Proper insertion and initial adhesion
*   **Daily care:** Gentle cleaning and protection from snags

### Optimizing Sensor Performance

To maximize your Stelo sensor's lifespan and accuracy:

*   **Keep the sensor area clean and dry when possible** - while Stelo is waterproof, minimizing unnecessary moisture exposure can help extend wear time
*   **Avoid excessive rubbing or friction** against clothing or during sleep
*   **Protect from impacts** during sports or physical activities
*   **Monitor adhesion daily** and contact support if edges begin lifting significantly
*   **Follow proper removal techniques** when replacing sensors to minimize skin irritation