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Laboratory operator Quest reports cyber breach affecting patient records

By Thomson Reuters Oct 22, 2026 | 6:40 AM

Oct 22 (Reuters) – Quest Diagnostics on Thursday said it learned of unauthorized access to its Quanum ​LSM system, which some ‌clients use to place test orders, receive and look up results.

The breach adds to a growing number of cyberattacks on ‌the ​healthcare sector, including those ⁠on medical device ⁠makers Abbott, Stryker, Medtronic and Boston Scientific. Drugmaker Novo Nordisk and drug-delivery equipment supplier West Pharmaceutical Services ​have also faced threats.

• While the full scope of unauthorized ⁠access remains under ⁠investigation, at this time Quest ​believes that an unauthorized party accessed ​certain patient records

• The company disclosed ‌in a regulatory filing that it learned of the incident on Wednesday and has notified federal law ⁠enforcement authorities and initiated cybersecurity incident response procedures

• This incident has not materially ⁠disrupted the ‌company’s business operations, it ⁠said

• Quest also reported ​third-quarter ‌earnings, with revenue of $3.10 billion, ​compared to ⁠estimates of $3.05 billion, as per LSEG data

• Quest shares fell 3.7% to $230 in premarket trading

(Reporting by Sneha S K in Bengaluru; Editing by ​Joyjeet Das)