Quest Diagnostics — Quanum system incident update

What it is

Quest Diagnostics’ notice, updated October 23, 2026 at 8:00 a.m. ET, reports unauthorized access to its Quanum Lab Services Manager system. Quest says some patient data was accessed, the affected access was paused, and its investigation is continuing. Includes provider and patient FAQs; the extent of affected data was not yet established.

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