What is CGM?

Continuous glucose monitoring (CGM) is a way to monitor glucose levels throughout the day and night using a small wearable sensor.

How CGM works

A CGM sensor uses a small filament placed just under the skin to measure glucose in interstitial fluid. Depending on the system, glucose information is sent to a compatible smartphone app, receiver or connected diabetes device.

Understanding your readings

CGM systems can display your current glucose reading, usually in mmol/L in Australia, together with trends showing whether glucose is rising, falling or relatively stable. Many systems also provide optional high and low glucose alerts.

CGM and finger-prick testing

CGM measures glucose in interstitial fluid rather than directly in blood, so CGM and blood glucose meter readings may not always be identical, particularly when glucose levels are changing quickly. Follow the instructions for your specific device about when a blood glucose check may be required.

Typical CGM components

• Sensor: worn on the body and measures interstitial glucose.
• Transmitter: built into some sensors or supplied separately, sending glucose data to the display device.
• Display: a compatible smartphone, receiver or other supported device.

Before choosing a CGM

Consider sensor wear time, compatible phones and apps, alerts, water resistance, age indications and compatibility with other diabetes technology. Product suitability varies, so discuss your individual needs with a qualified healthcare professional.

Important information: This page provides general educational information only and is not medical advice. Always read the label, follow the directions for use and consult your healthcare professional regarding your individual circumstances.