Quest Diagnostics says Quanum LSM access exposed patient records
Original title: Quest Diagnostics confirms data breach exposed patient records
The lab learned of the access on October 21, has not named the data types, and found no group claiming the attack.
Quest Diagnostics told the SEC it learned on October 21, 2026, of unauthorized access to Quanum LSM, a system some clients use to order tests and view results. The company says it believes some patient records were exposed but is still determining which data types. Quanum LSM is stopped, Essential Insights and LabHQ access is paused, and customer-facing operations plus direct LIS and EMR interfaces were not disrupted.
Unconfirmed: Quest has not determined which data types were exposed, and no threat group has been found claiming the attack.
- Quest operates 7,700 sites, employs 65,000 people, and reports more than $11 billion in revenue.
- Customers are told to use paper requisitions or Quanum eLabs for orders and results.
- External experts are investigating and law enforcement has been notified.
- A separate 2019 AMCA billing breach exposed about 11.9 million Quest patients.
Impact: Some patient records believed exposed; data types unknown
| Product | Affected |
|---|---|
| Quest Diagnostics Quanum LSM | — |
- 1.Use paper requisitions or Quanum eLabs while Quanum LSM is stopped.
- Vendors
- Quest Diagnostics
- Victims
- Quest Diagnostics
- Organizations
- U.S. Securities and Exchange Commission
- Countries
- United States
From the original article
2 min read at bleepingcomputer.com
American clinical laboratory company Quest Diagnostics disclosed that patient records have been exposed after a threat actor gained unauthorized access to its Quanum LSM system. [...]
By Bill Toulas · bleepingcomputer.com
A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.