Skip to main content

An update on an incident involving one of our systems

Hide
Quest Diagnostics

An update on an incident involving one of our systems

As of 8:00 am ET, October 26, 2026

We have remediated the security incident involving unauthorized access to our Quanum Lab Services Manager (LSM) system. The system has been securely restored and is available to clients. Systems that were temporarily paused as a precautionary measure have also been restored and are operating securely. Our core business operations were not impacted by this incident and remain up and running.

Providers that use direct-customer LIS interfaces or EMRs to order testing from us can continue to place orders through those interfaces, which were not affected. Any client that requires assistance resetting their credentials for the Quanum LSM system should call our IT Connectivity Help Desk at 1-800-697-9302.

Due to call volume, callers may experience longer-than-average wait times. We regret the inconvenience and thank you in advance for your patience.  

We take privacy and security seriously. While our systems have resumed normal operations, we continue to investigate the incident to understand the full scope of the unauthorized access, including to patient information. As our investigation continues, we will notify those patients and providers that we have determined have been affected and report to the relevant regulatory authorities.  

Sometimes after an incident, there may be phishing and social engineering attempts. Please be vigilant of phishing or voice phishing attempts and verify any communication about lab services or Quest, including breach-notification, credit-monitoring or settlement scams. Please leverage these resources on how to spot and report phishing attempts. Thank you.

View Provider FAQs
View Patient FAQs

Provider FAQs

The Quanum Lab Services Manager (LSM) system, which certain clients use to place test orders and receive and look up results. We have since resolved the issue and securely restored access to the system.

While no data was accessed in these other systems, out of an abundance of caution, we paused access temporarily. We have since resolved the issue and securely restored access to these systems. 

We terminated the unauthorized access and contained the incident. We are continuing to investigate the incident to understand its full scope.

Yes, we are communicating with the appropriate authorities in law enforcement.

We believe some patient data within Quanum LSM was accessed, but other systems were not affected. We are working diligently to investigate the incident to determine the specific data affected.  As the covered entity, Quest Diagnostics will make notifications as required by applicable law. 

Yes, but we are still investigating to determine the specific data affected. 

We are working as quickly as possible to complete the investigation, which is the first step.  We will notify those providers and patients that are determined to be affected by this incident. While we are working as quickly as possible, this process takes time. Please be assured that we take this issue very seriously and our teams are working diligently to address these concerns as quickly as possible. 

Any client that requires assistance resetting their credentials for the Quanum LSM system should call our IT Connectivity Help Desk at 1-800-697-9302.

Due to call volume, callers may experience longer-than-average wait times. We regret the inconvenience and thank you in advance for your patience as our team securely restores full access for our clients.  

The results for any test orders placed through Quanum eLabs will also be available through Quanum LSM. 

We do not expect delays in appointment scheduling or turnaround reporting times. However, clients or patients that call 1-866-MYQUEST may experience longer-than-normal wait times.

Based on our investigation, the incident is not related to a PHP programming language issue. 

 

Patient FAQs

We appreciate and share your concern. We believe patient data may have been affected and are working as quickly as possible to determine the specific data involved.  

Yes. Our investigation is ongoing. We will notify patients determined to be affected as required by applicable law.  

We are working as quickly as possible to complete the investigation, which is the first step. We will notify those patients who are determined to be affected. While we are working as quickly as possible, this process takes time. Please be assured that we take this issue very seriously and our teams are working diligently to address these concerns as quickly as possible. 

Our investigation is ongoing. However, based on our investigation to date, personal information and patient records were affected. We are working quickly to identify affected patients and their information involved.

We have published a notice and frequently asked questions for providers, patients and others on our website. Once we complete the investigation, we will notify affected providers as well as patients. 

Upon completion of our investigation, we will send notification letters to affected patients, which will describe the resources available, including credit and identity monitoring.

Back to top

Our company

Quest® is the brand name used for services offered by Quest Diagnostics Incorporated and its affiliated companies. Quest Diagnostics Incorporated and certain affiliates are CLIA-certified laboratories that provide HIPAA-covered services.  Other affiliates operated under the Quest® brand, such as Quest Consumer Inc., do not provide HIPAA-covered services. 

 

Quest®, Quest Diagnostics®, any associated logos, and all associated Quest Diagnostics registered or unregistered trademarks are the property of Quest Diagnostics. All third-party marks—® and ™—are the property of their respective owners. © 2026 Quest Diagnostics Incorporated. All rights reserved. Image content features models and is intended for illustrative purposes only. May include AI-generated and/or AI-modified imagery.