What Is This About?

If you or your provider sent a sample for testing to Diagnostic Lab of Oklahoma, Sonora Quest Laboratories, or another Quest Diagnostics joint venture company, your personal and protected health information may be at risk from a recent data breach announced by Quest Diagnostics (“Quest”). Our firm is investigating this incident and can help you understand your rights and legal options.

What Happened?

On October 22, 2026, Quest filed a form 8-K with the U.S. Securities and Exchange Commission (“SEC”) in which it reported that an unauthorized party accessed patient records on and/or before October 21, 2026.  The unauthorized access was detected within Quest’s Quanum LSM system, which is used by Diagnostic Lab of Oklahoma, Sonora Quest Laboratories, and other partners or clients of Quest to place test orders and access results.

Quest has notified law enforcement of the breach and is working with external cybersecurity experts to investigate the nature and scope of the breach and to implement appropriate security measures.

What Information Was Impacted?

While Quest’s review of impacted information is ongoing, based on its disclosure to the SEC, the following categories of information may have been affected:

• Names;
• Health information such as patient records and lab test results; and
• Other sensitive personal information and protected health information.

What Action Can You Take?

Levi & Korsinsky, LLP is investigating whether affected persons are entitled to compensation. If you had a sample tested at Diagnostic Lab of Oklahoma, Sonora Quest Laboratories, or another Quest Diagnostics joint venture company, there is no cost or obligation to participate. Follow the link below to find out about your rights and potential legal remedies available.