Continuous glucose monitors have transformed diabetes care, but they don't tell the whole story
Continuous glucose monitors have transformed life for many people with type 1 diabetes. Instead of relying on finger-prick blood tests throughout the day, users can track their blood sugar levels almost continuously. This allows them to receive alerts via a smartphone when levels become too high or too low and spot patterns that help them better manage their condition.
Continuous glucose monitors have revolutionized diabetes care by allowing people with type 1 diabetes to continuously track their blood sugar levels and receive alerts when levels become too high or too low. However, these devices have a limitation: they cannot accurately measure blood sugar levels that exceed their measurement range.
This means that during extreme high or low blood sugar episodes, the monitor can only confirm that levels are extremely high or low, but it cannot specify exactly how high or low they are. This "blind spot" affects nearly everyone with type 1 diabetes over time, with more than one-third of episodes remaining at the upper measurement limit for at least an hour in some cases.
Younger people and those with higher HbA1c levels (a blood test reflecting average blood sugar over the previous two to three months) are more likely to experience this limitation. Despite this, standard summary measures used in clinical practice, such as average glucose levels and time spent within the target glucose range, remain largely unaffected.
The main consequence is a loss of detail during the most extreme glucose events, but this does not undermine the overall usefulness of continuous glucose monitors in diabetes care.
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