Quest Diagnostics confirms data breach exposed patient records

Quest Diagnostics confirmed a data breach on October 21, 2026, after unauthorized access was detected in its Quanum LSM system, used by healthcare providers to manage lab services and access test results. The company believes patient records were exposed, though the exact data types and scope remain under investigation. No threat group has claimed responsibility, and operations were not disrupted, but access to affected systems has been paused as a precaution.

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