In the past, individuals who wanted to check their blood sugar at home typically relied on a glucometer, which requires a fingerstick to draw a small blood sample for testing on a strip. For many people with diabetes, this method can be time-consuming, uncomfortable, and discouraging, often leading to skipped checks and sore fingertips.
Today, continuous glucose monitors (CGMs) offer a more convenient and efficient alternative for people with type 1 or type 2 diabetes. While the first CGM received FDA approval back in 1999, these devices have become increasingly popular in recent years due to lower costs, improved technology, and easier use.
CGMs allow users to view real-time glucose trends and receive immediate feedback on how diet, exercise, and medication affect their levels. This technology has made daily diabetes management more seamless, accurate, and user-friendly. In this article, we’ll highlight the most advanced CGMs available in 2025, compare their key features, and offer guidance on selecting the right option for your needs.
What is a CGM Monitor and How Does It Work?
A continuous glucose monitor (CGM) is a device that tracks blood sugar levels in real time. Most CGMs include a sensor and a reader, which typically communicate via Bluetooth. Some systems may also feature a transmitter that wirelessly sends glucose data from the sensor to the reader. In earlier CGM models, the transmitter was a separate component that had to be manually attached to the sensor after it was applied to the body. However, newer models have the transmitter built directly into the sensor, making it invisible and requiring no extra steps. Many modern CGMs also allow your smartphone to function as the reader using an approved app, offering added convenience in a world where phones are already central to daily life.
How the Freestyle Libre Sensor Works
Freestyle Libre is a continuous glucose monitoring (CGM) system designed to track blood sugar levels in real-time. It consists of a small sensor worn on the back of the upper arm and a reader or compatible smartphone app that displays glucose data. The sensor measures glucose levels in the interstitial fluid and sends the information wirelessly to the reader or phone using Bluetooth technology. In earlier CGM systems, a separate transmitter was required to send data, but Freestyle Libre’s newer designs have the transmitter integrated directly into the sensor. This streamlined design allows for discreet, convenient monitoring without fingersticks, and users can check their glucose levels anytime using their phone or the dedicated reader.
What is Freestyle Libre?
The Freestyle Libre 2 Plus and Libre 3 Plus are the two latest models manufactured by Abbott. According to Abbott, the original Libre 2 and Libre 3 models will be phased out and replaced by the Libre 2 Plus and Libre 3 Plus by September 2025. Abbott has encouraged patients to begin transitioning to the Libre 2 and 3 Plus models, which have extended 15-day wear time and compatibility.
Advantages of the Freestyle Libre CGM system include:
- Glucose readings every minute (vs. every 5 minutes on some CGMs)
- Compact, discreet sensor design
- No routine fingersticks for calibration
- Compatibility with smartphones for added convenience
Freestyle Libre 2 vs 3
| Feature | Freestyle Libre 2 Plus | Freestyle Libre 3 Plus |
| Real-Time Glucose Data | Requires manual scanning to view data | Sends glucose data automatically every minute |
| Alerts for High/Low Glucose | Yes (customizable, optional) | Yes (real-time, customizable) |
| Sensor Size | Slightly larger | Smallest CGM sensor on the market |
| Sensor Wear Duration | Up to 15 days | Up to 15 days |
| Accuracy | High | Slightly improved over Libre 2 Plus |
| FDA Approval for Dosing | Yes (can be used for insulin dosing decisions) | Yes |
| Glucose Trend Arrows | Yes | Yes |
| Warm-Up Time After Insertion | ~1 hour | ~1 hour |
| Scan Requirement | Required to view readings | Not required – data sent automatically |
A Day with the Freestyle Libre
Wearing a Freestyle Libre sensor changes how you manage your day, without requiring you to adjust your daily routine to manage your glucose.
Morning: No Guesswork Before Breakfast
You wake up and check your phone. The Freestyle Libre 3 app shows a steady overnight glucose trend with no unexpected drops. No need for a fingerstick. No hassle. Just a clear look at how your body handled last night’s dinner.
Before breakfast, you do a quick scan of your sensor. If you’re using Freestyle Libre 2, the reader picks up your glucose level instantly. It’s easy to check how your glucose reacts to food, coffee, or even stress before the day gets going.
Afternoon: On the Move with a Wearable Glucose Monitor
Whether you’re sitting at your desk, walking the dog, or squeezing in a quick workout, your wearable glucose monitor tracks your levels in the background. A quick glance at your phone shows if you’re trending up, down, or staying stable. If there’s a significant shift, your Libre 2 or 3 can alert you in real time.
You don’t have to stop what you’re doing. There’s no need to carry around test strips or lancets, just data when you need it.
Evening: Learning Your Patterns
Dinner is where the insight pays off. You try a new meal and watch how your body responds. Over time, the Abbott Freestyle Libre system helps you identify trends, such as how your glucose levels behave after consuming carbs or whether stress affects your levels more than you thought.
Before bed, you check one last time. If you’re using Freestyle Libre 3, the data updates automatically. If it’s Libre 2, a quick scan gives you peace of mind for the night.
Getting Started: How to Get a CGM Like Freestyle Libre
If you’re looking to track blood sugar levels for general wellness or if you’re prediabetic, Abbott’s Lingo CGM is available online without a prescription. For those with type 1 or type 2 diabetes, ask your doctor about obtaining a FreeStyle Libre CGM. It is recommended to review how to place the sensor initially to get more comfortable doing it by yourself in the future. Additionally, the CGM applications contain valuable data and reports that might help you better understand the changes in your blood sugar levels.
Understanding Sensor Errors and How to Fix Them
Even though Freestyle Libre sensors are designed to be reliable, occasional issues can happen. A sensor error can be frustrating, but most are easy to troubleshoot and resolve without needing to restart your entire system.
Common Freestyle Libre Sensor Errors
Here are a few typical reasons you might see an error message:
- The sensor was applied incorrectly or became loose too soon
- The sensor was scanned before it finished its warm-up period (about 60 minutes)
- You were near strong electromagnetic fields (like an MRI or X-ray machine)
- The sensor expired or was accidentally dislodged
- There’s a temporary communication issue with the reader or app
How to Fix a Sensor Error
If you receive a message like “Sensor Error” or “Try Scanning Again in 10 Minutes,” try the following steps:
- Wait and rescan: Some errors are temporary and resolve on their own after a few minutes.
- Check the sensor site: Make sure it’s still securely attached and not irritated or lifted at the edges.
- Restart the app or reader: A simple reboot may clear up a glitch.
- Avoid scanning during the warm-up period: If you just applied a new sensor, wait the full hour before scanning.
- Stay away from water immediately after application: Let the adhesive set properly to avoid early detachment.
When to Call Freestyle Libre Support
If the sensor fails entirely or comes off early, contact Freestyle Libre support for help. You may qualify for a Freestyle Libre replacement sensor at no cost if:
- The error occurred despite proper use
- The sensor failed before the 14- or 15-day wear period ended
- You’ve followed the correct troubleshooting steps
Keep your sensor’s packaging and lot number, as the support team may request them.
Freestyle Libre Coverage: Is It Affordable?
Commercial Insurance
Most commercial insurance plans provide coverage for continuous glucose monitors (CGMs) in individuals with type 2 diabetes who use insulin or experience frequent episodes of low blood sugar. Depending on the plan, patients may be responsible for a copay each time they refill their CGM sensor prescription.
Medicare
Medicare Part B may cover CGMs through a durable medical equipment (DME) supplier for people with type 2 diabetes who are on insulin therapy or have documented problematic hypoglycemia. To qualify, your healthcare provider must submit specific documentation, such as recent visit notes and proof of CGM training, to support coverage.
Medicaid
Medicaid coverage varies by state. Like Medicare and commercial plans, most states require patients to meet certain clinical criteria to qualify for CGM coverage. It’s best to contact your state’s Medicaid office or check your plan documents to confirm if CGMs are included as a benefit.
Cash
For those paying out-of-pocket, CGMs can be costly, often ranging from $200 to $250 per month for a set of two sensors. However, using manufacturer coupons or enrolling in patient assistance programs may significantly lower the cost.
How Freestyle Libre Compares to Other CGMs
Freestyle Libre is a popular wearable glucose monitor that offers reliable, real-time glucose tracking without fingersticks. Compared to other CGM monitors, it’s generally more affordable, easier to apply, and doesn’t require calibrations. However, it may have fewer advanced features than some competitors.
Freestyle Libre vs Dexcom
Dexcom CGMs (like the G6 and G7) provide automatic, real-time glucose readings and are known for fast alerts and integration with insulin pumps. Freestyle Libre offers similar accuracy, is less expensive, and doesn’t require fingerstick calibrations. However, Dexcom’s alerts are always active, while Libre 2’s are optional, and Libre 3’s are app-based.
Freestyle Libre vs Medtronic
Medtronic CGMs are often paired with their insulin pumps and require calibration with fingersticks. While they’re powerful tools for insulin users, the Freestyle Libre sensor is easier to apply, doesn’t need calibrating, and is more discreet for daily wear.
Freestyle Libre vs Eversense E365
Eversense is the only implantable CGM, lasting up to 6 months. It requires a minor procedure and is bulkier due to a transmitter worn over the skin. In contrast, Freestyle Libre 3 is fully disposable, small, and easy to apply at home, making it more accessible for most users.
Final Thoughts: Is Freestyle Libre Worth It?
Freestyle Libre has become one of the most widely used glucose monitoring devices for a reason. It provides a reliable and low-maintenance way to track your blood sugar levels throughout the day. With multiple models to choose from, including the Freestyle Libre 2 and Freestyle Libre 3, users can find a version that fits their lifestyle, whether they prefer scanning manually or getting automatic, real-time updates through their smartphone.
If you’re looking for a CGM monitor that’s easy to use, affordable, and doesn’t require fingerstick calibrations, Freestyle Libre is a practical and user-friendly option. It provides valuable insights into how your body responds to food, activity, stress, and medication, empowering you to make smarter decisions about your health. Talk to your healthcare provider to find out if Freestyle Libre is right for you and how to get started.
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