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Quest Diagnostics Lab System Breached; Patient Test Results Access Suspended

Quest Diagnostics, a major diagnostic services provider, has suspended access to its test results system following a cybersecurity incident. The company said it discovered the breach and immediately halted system access while working towards full restoration.

LSN India · 23 October 2026

Quest Diagnostics Lab System Breached; Patient Test Results Access Suspended

Quest Diagnostics has paused access to its patient test results system after identifying a cybersecurity breach, the company announced. The diagnostic services provider said it took immediate action upon discovering the incident to prevent further unauthorised access and protect patient data.

The breach marks another significant cybersecurity incident affecting the healthcare sector in the region. Quest Diagnostics is among the largest diagnostic laboratory networks operating across multiple countries, serving millions of patients annually through its testing and diagnostic facilities.

The company stated it is actively working to restore full functionality to the affected system as quickly as possible. Quest has not yet disclosed specific details regarding the scope of the breach, the number of potentially affected patients, or the timeline for system restoration.

Healthcare organisations across South and Southeast Asia have increasingly become targets of cyberattacks in recent years, with patient data and sensitive health information becoming valuable commodities for threat actors. Regulatory authorities in various jurisdictions have intensified scrutiny on healthcare providers' cybersecurity protocols and data protection measures.

Quest Diagnostics has not issued detailed information about the nature of the incident or whether it has notified affected patients and regulatory bodies as required by data protection guidelines.

Photo: A Quest Diagnostics location in Manteca, California, May 2021. TaurusEmerald via Wikimedia Commons (CC BY-SA 4.0).