Quest says patient records accessed through Quanum system

Quest Diagnostics says an unauthorized party accessed certain patient records through its Quanum Lab Services Manager, a system used by some health care clients to order tests and retrieve results. The company has not determined how many people were affected or which specific records were accessed, and its investigation is continuing. Quest’s filing with the U.S. Securities and Exchange Commission says the company discovered the unauthorized access on October 21, 2026. In a security notice dated October 23, Quest said protected health information and personally identifiable information were involved, but it has not identified the particular categories of data. The disclosure does not establish that specific test results or diagnoses were accessed. The company said it notified law enforcement and engaged outside cybersecurity specialists as part of its response. It paused access to Quanum Lab Services Manager while investigating. Quest also said its core business operations and ability to serve patients were not materially disrupted. Providers who use the paused system could submit orders on paper or use Quanum eLabs, according to the company’s statements. Other electronic...