🔥 0 ⚡ 0 XP
← Back to Path
1 / 6

CHEMISTRY

How each one makes its signal

Dexcom Glucose oxidase, with peroxide detected at platinum
FreeStyle Libre Wired enzyme with an osmium mediator, at low voltage
Medtronic Guardian Glucose oxidase, with peroxide detected at an electrode
Eversense A fluorescent polymer, with no enzyme
Three enzyme designs and one optical design cover today's market.

WEAR TIME

How long each sensor lasts

Medtronic Guardian About 7 days
Dexcom 10 days, and a newer 15-day version
FreeStyle Libre 14 days
Eversense Months, up to a year in the newest version
Values change with each product generation, so check the current specifications.

READING RATE

How often you see a value

Dexcom About every 5 minutes
FreeStyle Libre 3 About every minute
Medtronic Guardian About every 5 minutes
Eversense About every 5 minutes
A faster update rate shows changes sooner, but sensor lag still applies.

FORM FACTOR

What you actually wear

Dexcom G7 One small disposable with the transmitter built in
FreeStyle Libre 3 A very small integrated disc
Eversense An implant plus a removable transmitter and adhesive
Medtronic Guardian A sensor with a separate reusable transmitter, and a newer all-in-one version
Smaller, integrated designs trade reusability for convenience.

CHOOSING

There is no single best

🎯

Accuracy and alerts

Look at published accuracy, alerts, and how readings reach your phone

🔌

Ecosystem

Check which insulin pumps and apps the sensor works with

💲

Cost and coverage

Price, insurance, and wear time all matter in practice

The best sensor is the one that fits a person's needs and devices.

UNIT 14 STUDY COMPLETE

⚖️

Ready for the Fab Challenge?

You've compared the leading CGM designs on chemistry, wear, readings, and form.