Quest Diagnostics confirmed that patient health information or personally identifiable information was involved in a cybersecurity breach that prompted the medical testing giant to temporarily suspend access to several systems.
The New Jersey-based company said Thursday that it disabled access to its Quanum Lab Services Manager (LSM) platform after discovering unauthorized access Wednesday. Quest expects to restore full functionality as soon as Friday.
The platform allows certain healthcare providers to order laboratory tests and access results.
Quest said it believes some patient data was accessed but is still investigating the specific information involved and how many people may have been affected.
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The company also temporarily paused access to its Essential Insights and LabHQ systems as a precaution, although it said no data was accessed on those systems.
Despite the temporary restrictions, Quest said its core business operations remain unaffected and its ability to serve patients has not been materially disrupted.
Healthcare providers who normally use Quanum LSM can continue placing orders through paper requisitions or the company’s Quanum eLabs platform. Other electronic ordering systems remain operational.
Quest said it has stopped the unauthorized access and is working to restore the affected system. The company does not expect testing delays for clients who do not use Quanum LSM.
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In a Thursday filing with the Securities and Exchange Commission, Quest said it notified federal law enforcement authorities and enlisted outside cybersecurity experts to assist with its investigation and response.
The company said it is working to identify affected patients and healthcare providers and will issue notifications as required by applicable law.
Quest Diagnostics, one of the nation’s major providers of diagnostic testing services, reported approximately $11 billion in revenue in 2025.
The incident follows a previous cybersecurity breach involving a third-party billing provider that potentially exposed personal information belonging to millions of Quest patients.
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In 2019, Quest disclosed that American Medical Collection Agency had reported unauthorized access to a system containing information associated with approximately 11.9 million Quest patients. The company said its own information technology systems were not involved in that incident.
Quest has not disclosed whether the latest breach will result in financial consequences, and declined further comment to FOX Business.
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