Dexcom
Dexcom G6
As of August 2026 we track 8 continuous glucose monitors available here, and the cheapest one you can buy without a prescription is the FreeStyle Libre 2 Plus at about £103.98 a month.
Specifications
| Wear time | 10 days |
|---|---|
| Warm-up | 120 minutes |
| Accuracy (MARD) | 10% (independent study) |
| Readings | every 5 min |
| Alarms | Yes |
| Prescription | Required |
What does the accuracy figure mean?
MARD is the average gap between what the sensor says and what a laboratory blood test says, as a percentage. A 10% MARD means readings are off by about 10% on average — so a true 7.0 mmol/L might show as anywhere around 6.3 to 7.7. Lower is better. Most current sensors sit under 10%; twenty years ago they were over 20%. No sensor is exact, which is why treatment decisions still get confirmed with a fingerstick when a reading does not match how you feel.
Pricing
Not published
to try
Not published
per year
- per sensor · 10 days
- Not published
- per month
- Not published
Prices last checked: 2026-08-05
What works well
- Long track record and broad compatibility with insulin pumps
- Predictive low-glucose alert rather than only a threshold alarm
What to watch out for
- Two-hour warm-up, four times longer than the G7
- 10.0% MARD, the least accurate figure among the sensors here that have published one
- Being phased out in favour of the G7 in most markets
Our verdict
Superseded. Choose it only if a pump or clinic you depend on still requires it — otherwise the G7 is more accurate and warms up far faster.
Common questions
- Is the Dexcom G6 still available?
- It is being phased out in favour of the G7, though it remains supported where pumps and clinics still depend on it.