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Certain glucose monitors from Abbott Diabetes Care are providing users with incorrect glucose readings, an error that has been linked with the deaths of at least seven people and more than 700 serious injuries worldwide, according to an alert from the US Food and Drug Administration.

Incorrect glucose readings can lead to improper treatment. Abbott warned that about 3 million FreeStyle Libre 3 and FreeStyle Libre 3 Plus sensors are affected, but no other Libre products. Patients can visit FreeStyleCheck.com to see if their sensors are affected and to get a replacement for free.

The FDA has also published specific information about the affected products in its alert. The agency considers this to be a “potentially high-risk issue” and will continue to update its website as information becomes available.