Continuous glucose monitoring

What happens

A sensor worn on the arm for one to four weeks samples interstitial glucose every few minutes, producing a continuous curve rather than a single fasting value.

How to read the result

In people with diabetes or prediabetes, time in range and post-meal excursions guide treatment directly. In metabolically healthy adults the data are best used as short-term behavioural feedback on specific meals and training.

Where it stops

Interstitial readings lag capillary glucose and carry a margin of error. Normal glucose variability in healthy people is routinely misread as pathology, and the practice of chasing flat curves has no outcome evidence.