US lab giant Quest Diagnostics' Quanum system breached; patient records accessed

Quest Diagnostics told the SEC it learned on October 21, 2026 of unauthorized access to its Quanum LSM system, which clients use to place test orders and look up results, and believes an unauthorized party accessed certain patient records ^[1]. Quest says it remediated the incident, restored the system and will notify affected patients and providers; according to Medical Daily, it has not said how many people or which details are involved ^[2][3]. Quest urges people to be vigilant of phishing and voice phishing and verify any communication about lab services or Quest, including breach-notification, credit-monitoring or settlement scams ^[2].

Industries mainly affected: Healthcare

1. Be vigilant of phishing and vishing; verify any communication claiming to be from Quest ^[2].
2. If unsure, ask your provider's office whether it uses Quanum to order Quest tests .