Quest Diagnostics reports cyber breach of patient records
What happened
Quest Diagnostics announced that it identified a cyber breach involving one of its systems during the week of October 22, 2026.
The company stated that the incident likely compromised certain patient records.
Why it matters
The breach affects the security of sensitive medical information managed by a major clinical laboratory, potentially exposing patient data to unauthorized access.
Context
Quest Diagnostics is an American clinical laboratory company that provides diagnostic testing services across the United States and internationally.
As of 2020, the company employed approximately 48,000 people and reported over $7.7 billion in revenue for 2019.
Sources 2 sources
This briefing cites 1 publisher across 1 detected independent reporting stream.
- Buffalo Quest Diagnostics reports cyber breach affecting 'certain patient records'
- Wikipedia Quest Diagnostics Background reference · Wikipedia text used under CC BY-SA 4.0.