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Quest Diagnostics reports cyber breach affecting ‘certain patient records’

Quest said certain patient records may have been accessed, and the company notified federal law enforcement as it investigates the breach.

  • On Thursday, October 22, 2026, Quest Diagnostics reported "unauthorized access" to its Quanum Lab Services Manager platform after discovering the incident on Wednesday and notifying federal law enforcement.
  • The compromised Quanum platform allows clients to place test orders and receive results; Quest confirmed to The Associated Press that this breach is unrelated to recent global PHP vulnerabilities.
  • While the full scope remains under investigation, Quest believes "certain patient records" were accessed; the company stated the incident has not materially disrupted business operations.
  • Past incidents include a 2016 breach exposing data of about 34,000 people and a 2019 hack at American Medical Collection Agency affecting about 11.9 million patients.
  • Cyberattacks on the healthcare sector are rising, impacting device makers Abbott, Stryker, Medtronic, and Boston Scientific as governments and organizations worldwide prioritize security updates.
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Quest Diagnostics reports cyber breach affecting 'certain patient records'

Medical laboratory operator Quest Diagnostics said it learned of a cyber breach of one of its systems this week, likely compromising some records for patients.

·New York, United States
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WTVB broke the news on Thursday, October 22, 2026.
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