Buying Guide
How to Buy Continuous Glucose Sensors
This short guide helps you choose the right continuous glucose sensor (CGM) by focusing on what matters most: accuracy, wear time, connectivity, cost and availability. Use these quick checks to compare options and act fast when stock is limited.
Key factors to consider
Accuracy and calibration: Look for sensors that report tissue glucose without frequent fingerstick calibration.
- Wear time per sensor: common options are around 10 days or 14 days; longer wear means fewer changes.
- Connectivity: confirm Bluetooth support and that the system works with your phone or a dedicated reader.
- Alerts and alarms: customizable high and low alerts are essential if you need proactive alarms.
- Insertion and comfort: one-click applicators reduce fuss and insertion discomfort.
- Cost and pack size: prices vary widely by kit and pack; check per-sensor price and consider multi-packs for savings.
- Availability and shipping: some listings show low stock or shipping charges, so check quantities and delivery before committing.
Types and pack options
Sensor-only vs sensor plus reader: you can buy sensors that pair with a smartphone or sensors bundled with a dedicated reader.
- Short term sensors: single-sensor packs for occasional replacement or trial.
- Multi-packs: 2 or 3 sensor packs reduce cost per sensor and cut down reorder frequency.
- Reader-only options: buy a reader if you prefer not to use a smartphone app or need a spare display device.
Important features and specifications to check
Wear duration and replacement cadence: check listed wearing time (for example 10 days or 14 days) and plan how many sensors you need for a month.
- Calibration requirements: no-calibration sensors save time and reduce fingerstick checks.
- App compatibility: confirm support for your phone OS and that the app shows trends and logs.
- Bluetooth range and reliability: short range pairing is common; one listing indicated about 6 m connectivity.
- Alarm system: verify high and low alerts and whether they are adjustable.
- Unit settings: ensure the product displays mmol/L if that is your preferred unit.
- Expiry, adhesive and water resistance: check expiry dates, adhesive strength for active users, and water resistance rating.
Where to buy, common mistakes and expert tips
Online vs retail: online stores often have better selection and fast reordering; retail outlets let you inspect packaging and ask staff questions. Check shipping costs and free shipping offers.
- Do not buy from unknown sellers: buy from authorised channels to avoid counterfeit or expired sensors.
- Match sensors to your display method: avoid buying a sensor that is not compatible with your reader or app.
- Watch stock messages: low stock notices are real. If you rely on continuous monitoring, keep a spare supply.
- Compare per-sensor cost: divide package price by number of sensors to compare value.
- Check return and warranty policies: especially for readers and unopened sensor packs.
- Practical tips: buy a multi-pack to save on per-sensor cost, pair your phone before first use, keep one spare sensor on hand, and confirm insurance or reimbursement options before buying.
Final Thoughts
Choose a sensor that balances reliable accuracy, suitable wear time, compatible connectivity and predictable cost. Prioritise authorised sellers, check stock and buy a small multi-pack first to confirm comfort and app compatibility before committing to a longer supply.
