Other Events ·
Quest Diagnostics reports unauthorized access to Quanum LSM system affecting patient records
DGXQuest Diagnostics Inc
On October 21, 2026, Quest Diagnostics learned of unauthorized access to its Quanum LSM system, which clients use to place test orders and view results. The company initiated cybersecurity response procedures, notified federal law enforcement, and engaged external experts to investigate the scope of the breach. Management believes an unauthorized party accessed certain patient records but stated that operations have not been materially disrupted. Quest Diagnostics operates in the clinical laboratory testing industry.