--- title: Quest Diagnostics confirms data breach exposed patient... description: Quest Diagnostics confirmed a data breach after a threat actor gained unauthorized access to its Quanum LSM (Lab Services Manager) system. The company learned... canonical: https://daily.dev/posts/quest-diagnostics-confirms-data-breach-exposed-patient-records-rfuebnstn twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Quest Diagnostics confirms data breach exposed patient records | daily.dev og:description: Quest Diagnostics confirmed a data breach after a threat actor gained unauthorized access to its Quanum LSM (Lab Services Manager) system. The company learned... og:url: https://daily.dev/posts/quest-diagnostics-confirms-data-breach-exposed-patient-records-rfuebnstn og:image: https://api.daily.dev/og/posts/RfuEbNstN.png og:image:alt: Quest Diagnostics confirms data breach exposed patient records og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Quest Diagnostics confirms data breach exposed patient records **[BleepingComputer](https://daily.dev/sources/bleepingcomputer)** · 3 min read · 0 upvotes · 0 comments ## Summary Quest Diagnostics confirmed a data breach after a threat actor gained unauthorized access to its Quanum LSM (Lab Services Manager) system. The company learned of the intrusion on October 21, 2026, and says some patient records were exposed, though the exact data types affected are still unknown. Quest has stopped the Quanum LSM system and paused access to Essential Insights and LabHQ as a precaution, telling customers to use paper requisitions or Quanum eLabs instead. No threat group has yet claimed responsibility. Quest previously suffered a breach affecting 11.9 million patients in 2019 via billing vendor AMCA, after which at least 19 class-action lawsuits were filed. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What happened in the Quest Diagnostics data breach disclosed in October 2026? A threat actor gained unauthorized access to Quest Diagnostics' Quanum LSM (Lab Services Manager) system, which clients use to place test orders and receive results. Quest learned of the intrusion on October 21, 2026, and confirmed some patient records were exposed, though the specific data types affected remain undetermined. The company disclosed the incident in an SEC filing and notified law enforcement. _Track how healthcare breaches like this unfold by following security coverage on daily.dev._ ### Is the Quest Diagnostics Quanum LSM system still available after the breach? No, Quest Diagnostics has stopped the Quanum LSM system following the breach and also paused access to Essential Insights and LabHQ as a precaution. Customers are advised to use paper requisitions or the Quanum eLabs platform instead to place orders and receive results. Direct-customer LIS interfaces and EMRs were not affected. _Healthcare IT teams weighing vendor system outages can keep up with incidents like this on daily.dev._ ## Similar posts on daily.dev - [DentaQuest data breach exposed info of 2.6 million accounts](https://daily.dev/posts/dentaquest-data-breach-exposed-info-of-2-6-million-accounts-ockbsjjci) · BleepingComputer · 0 upvotes · 0 comments - [Thousands more learn their health info stolen from TriZetto](https://daily.dev/posts/thousands-more-learn-their-health-info-stolen-from-trizetto-dty784ghh) · The Register · 0 upvotes · 0 comments - [TriZetto confirms 3.4M people’s health and personal data was stolen during breach](https://daily.dev/posts/trizetto-confirms-3-4m-people-s-health-and-personal-data-was-stolen-during-breach-cfnfamzy1) · TechCrunch · 0 upvotes · 0 comments - [Ampath finds no evidence that test results were taken in breach](https://daily.dev/posts/ampath-finds-no-evidence-that-test-results-were-taken-in-breach-ofd0neob7) · TechCentral · 0 upvotes · 0 comments --- Tags: [#healthcare](https://daily.dev/tags/healthcare), [#data-breach](https://daily.dev/tags/data-breach) [View this post on daily.dev](https://daily.dev/posts/quest-diagnostics-confirms-data-breach-exposed-patient-records-rfuebnstn) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Quest Diagnostics confirms data breach exposed patient records","url":"https://daily.dev/posts/quest-diagnostics-confirms-data-breach-exposed-patient-records-rfuebnstn","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/quest-diagnostics-confirms-data-breach-exposed-patient-records-rfuebnstn"},"datePublished":"2026-10-23T16:40:12.518Z","dateModified":"2026-10-23T20:41:00.462Z","description":"Quest Diagnostics confirmed a data breach after a threat actor gained unauthorized access to its Quanum LSM (Lab Services Manager) system. 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