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Devices and technology

Continuous glucose monitoring (CGM)

Continuous glucose monitoring (CGM) uses a small sensor worn on the skin to measure glucose in the fluid under the skin every few minutes, day and night, and sends readings to a phone, reader or insulin pump.

Also called
CGM, continuous glucose monitor, glucose sensor, sensor, flash glucose monitoring, flash GM, FGM
Formerly called

What it means

A CGM shows your current glucose, which way it is heading and how fast, and can alarm for highs and lows. Most sensors last between 7 and 15 days and are applied at home. Sensor readings lag a little behind a finger-prick reading, so a blood glucose meter is still useful when symptoms do not match the sensor.

Through the NDSS, all people living with type 1 diabetes can apply for subsidised CGM, as can children and young people under 21 with conditions similar to type 1 diabetes who need insulin. Subsidised CGM is not currently available through the NDSS for type 2 diabetes, so people living with type 2 diabetes who use CGM usually pay the full cost.

Flash glucose monitoring is a related type of sensor that was originally read by scanning it with a reader or phone.

At PDC Health Hub
PDC Health Hub's diabetes educators help with choosing, starting and interpreting CGM.

Sources and clinical review

Clinically reviewed by
Teresa Di Franco
Last reviewed:
November 5, 2026
Next review due:
November 1, 2027

Questions about what this means for you?

Our clinicians can explain how this applies to you and help with the next step, whether that is a referral, a device, funding or a plan the rest of the team can see.

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