The Spanish Agency of Medicines and Medical Devices (Aemps), an agency dependent on the Ministry of Health, has issued an alert about a possible failure in the application Dexcom One+ iOS, used for continuous glucose monitoring in people with diabetes.
According to the Agency's communication, versions 1.5 and 1.6 of the software may not function correctly, causing some users to view outdated glucose values or incorrect trend arrows, which can delay important alerts.
Risk of undetected hypoglycemias and hyperglycemias
The main problem identified is that the application might not show a dangerous rise or fall in glucose in time.
This entails the risk that the user does not detect hypoglycemia or hyperglycemia in time, or that they make therapeutic decisions —such as administering insulin or ingesting glucose— based on erroneous information.
The incidence especially affects a tool that many patients use as their main reference in their day-to-day lives.
What is Dexcom One+ and why is it important
Dexcom One+ is a continuous glucose monitoring (CGM) system that measures levels in the interstitial fluid using sensors connected to a mobile phone.
It is authorized for people over two years of age, including pregnant women, and is designed to replace traditional capillary prick controls in many cases.
Its use has spread among patients with type 1 diabetes, insulin-dependent type 2, and profiles that require constant monitoring.
How the detected error occurs
The Aemps explains that the failure appears when the application returns to the foreground after having remained in the background for a while.
At that moment, the screen may flicker showing old data before loading current values, thus delaying the activation of critical alarms.
This is an incident similar to one previously detected in other applications of the company, such as Dexcom G7 iOS.
Mandatory update before April 30
Health authorities have asked users to check which version they have installed and update immediately if they are using any of the affected ones.
Additionally, Dexcom has communicated that from April 30, 2026 the old versions included in the notice will stop working, so the update will be mandatory to continue using the service.
Recommendations for patients and caregivers
Aemps recommends:
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Check the installed version of the app.
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Update to the latest available version on the App Store.
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Be aware of physical symptoms if the displayed data raises doubts.
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Confirm with capillary glycemia if there is clinical discrepancy.
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Contact Dexcom if the official notification has not been received.
Health technology under surveillance
The case once again puts the spotlight on the growing dependence on mobile applications for tracking chronic diseases. Tools like Dexcom have represented a notable advance in autonomy and quality of life, but they also demand constant security controls and rapid response to technical errors.
In vulnerable patients, a few minutes' delay in an alert can make a relevant difference.