Quest Diagnostics reported unauthorized access to patient records involving personal and health data.

What it means

Quest Diagnostics, one of the largest medical laboratory testing companies in the US, reported a data breach after discovering unauthorized access to patient records via its Quanum Lab Services Manager platform. The incident exposed personal and health data of an unspecified number of patients. The company disclosed the breach in a securities filing and is cooperating with law enforcement.

Accuracy & sourcesGrounded

The claim is well-sourced, originating from Quest Diagnostics' own filing with the Securities and Exchange Commission, which is a primary source. Multiple reputable news outlets (Reuters, TechCrunch, AP) corroborate the details, lending high confidence to the accuracy of the report.

How new

The news broke on October 22-23, 2026, making it a genuinely new development as of the publication window.

Go deeper

• Reuters (via Google News) — first to publish