> Enrich.chat gives AI agents verified work emails and mobiles. To use it from an agent, read https://enrich.chat/agents.md . This is the Markdown version of https://enrich.chat/company/quest-diagnostics/ # Quest Diagnostics A medical practice organization with 50,000 to 100,000 employees. Where it sits among its peers, the technology it runs and how to reach its people. By Enrich.chat Editorial. Updated October 21, 2026. **Short answer:** Quest Diagnostics (questdiagnostics.com) is a medical practice organization with 50,000 to 100,000 employees. Its public technology footprint includes Microsoft 365, Cedexis Radar, NGINX and Amazon SES. ## How big is Quest Diagnostics? Quest Diagnostics has 50,000 to 100,000 employees. Among the medical practices on this site it sits among the largest. Each dot in the figure is one of its peers, placed by size; the orange dot is Quest Diagnostics. **Figure: Where Quest Diagnostics sits among medical practices.** A strip of dots, one for each of 20 peers in medical practice, spread from 2,000 to 2,000,000 employees on a log scale. Quest Diagnostics is highlighted and falls in the 50,000 to 100,000 employees range among the largest. *Peers in medical practice placed by employee count on a log scale. Sizes are rounded ranges from public profiles.* Headcount on public company profiles is rounded and moves as a company hires, so use the range as a guide, not as a payroll figure. ## Where is Quest Diagnostics headquartered? Quest Diagnostics is headquartered in Secaucus, New Jersey. [Companies in New Jersey](https://enrich.chat/companies-in/new-jersey/) ## What industry is Quest Diagnostics in? Quest Diagnostics works in [medical practice](https://enrich.chat/industries/medical-practice/). This group covers physician groups, specialty practices and other clinics that provide outpatient medical care. Similar organizations on this site: [SYNLAB International](https://enrich.chat/company/synlab-international/), [Hamad Medical](https://enrich.chat/company/hamad-medical/), [AGC Group](https://enrich.chat/company/agc-group/), [Akkodis](https://enrich.chat/company/akkodis/), [Al Jaber Group](https://enrich.chat/company/al-jaber-group/) and [Alshaya Group](https://enrich.chat/company/alshaya-group/). ## What technology does Quest Diagnostics use? We detect 45 tools on Quest Diagnostics's public footprint across 15 categories, for example HubSpot for marketing automation and crm, NGINX for cloud and hosting and Stripe for e-commerce and payments. The figure counts the tools in each category; the groups below name them and link to the companies that use each one. **Figure: Tools detected at Quest Diagnostics, by category.** A bar chart of how many tools were detected at Quest Diagnostics in each category: Analytics and tracking 6, Marketing automation and CRM 5, Advertising and retargeting 5, Data and observability 4, Cloud and hosting 3, E-commerce and payments 3, Video and media 3. *Tools detected on the public footprint of Quest Diagnostics, by category.* ### Marketing automation and CRM [HubSpot](https://enrich.chat/companies-using/hubspot/)[Adobe Marketing Cloud](https://enrich.chat/companies-using/adobe-marketing-cloud/)[Oracle Eloqua](https://enrich.chat/companies-using/eloqua/)[ON24](https://enrich.chat/companies-using/on24/)[Silverpop (Acoustic)](https://enrich.chat/companies-using/silverpop/) ### Cloud and hosting [NGINX](https://enrich.chat/companies-using/nginx/)[Microsoft Azure Hosting](https://enrich.chat/companies-using/microsoft-azure-hosting/)[Oracle Cloud](https://enrich.chat/companies-using/oracle-cloud/) ### E-commerce and payments [Stripe](https://enrich.chat/companies-using/stripe/)[PayPal](https://enrich.chat/companies-using/paypal/)[Braintree](https://enrich.chat/companies-using/braintree/) ### Customer support and chat [Qualtrics](https://enrich.chat/companies-using/qualtrics/) ### HR and recruiting [iCIMS](https://enrich.chat/companies-using/icims/)[Cornerstone OnDemand](https://enrich.chat/companies-using/cornerstone-on-demand/) ### Data and observability [Cedexis Radar](https://enrich.chat/companies-using/cedexis-radar/)[Ruxit (Dynatrace)](https://enrich.chat/companies-using/ruxit/)[LiveRamp](https://enrich.chat/companies-using/liveramp/)[Dynatrace](https://enrich.chat/companies-using/dynatrace/) ### Email and productivity [Microsoft 365](https://enrich.chat/companies-using/microsoft-365/)[Amazon SES](https://enrich.chat/companies-using/amazon-ses/) ### Website platforms and CMS [WordPress (self-hosted)](https://enrich.chat/companies-using/wordpress-org/)[Adobe Experience Manager (CQ)](https://enrich.chat/companies-using/adobe-cq/) ### Analytics and tracking [Google Tag Manager](https://enrich.chat/companies-using/google-tag-manager/)[Google Analytics](https://enrich.chat/companies-using/google-analytics/)[Google Analytics Ecommerce Tracking](https://enrich.chat/companies-using/google-analytics-ecommerce-tracking/)[Adobe Analytics (Omniture)](https://enrich.chat/companies-using/omniture/)[Tealium](https://enrich.chat/companies-using/tealium/)[Piwik (Matomo)](https://enrich.chat/companies-using/piwik/) ### Advertising and retargeting [Adobe Media Optimizer](https://enrich.chat/companies-using/adobe-media-optimizer/)[LinkedIn Marketing Solutions](https://enrich.chat/companies-using/linkedin-marketing-solutions/)[DoubleClick Floodlight](https://enrich.chat/companies-using/doubleclick-floodlight/)[The Trade Desk](https://enrich.chat/companies-using/the-trade-desk/)[RocketFuel](https://enrich.chat/companies-using/rocketfuel/) ### Video and media [Vimeo](https://enrich.chat/companies-using/vimeo/)[YouTube](https://enrich.chat/companies-using/youtube/)[Adobe Scene7](https://enrich.chat/companies-using/scene7/) ### Social and widgets [Disqus](https://enrich.chat/companies-using/disqus/) ### Frameworks and libraries [Angular JS v1](https://enrich.chat/companies-using/angular-js-v1/) ### Fonts, maps and embeds [Google Maps](https://enrich.chat/companies-using/google-maps/)[Google Maps (non paid)](https://enrich.chat/companies-using/google-maps-non-paid/)[Google Places API](https://enrich.chat/companies-using/google-places/) Tools change as companies adopt and drop them. Check a single company at any time with the free [tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/). ## How do I find the right people at Quest Diagnostics? Start from the website, questdiagnostics.com. Enter it in the free email finder with a name, or ask your AI agent for the people in the roles you sell to, such as practice administrators, physicians and clinic managers. ```text Use www.enrich.chat to find the practice administrators, physicians and clinic managers at questdiagnostics.com, with titles and verified work emails ``` Staff addresses follow a known pattern: see the [Quest Diagnostics email format](https://enrich.chat/email-format/quest-diagnostics/). ## Which other companies use the same tools? See who else runs the tools Quest Diagnostics uses: [Microsoft 365](https://enrich.chat/companies-using/microsoft-365/)[Vimeo](https://enrich.chat/companies-using/vimeo/)[YouTube](https://enrich.chat/companies-using/youtube/)[WordPress (self-hosted)](https://enrich.chat/companies-using/wordpress-org/)[Adobe Media Optimizer](https://enrich.chat/companies-using/adobe-media-optimizer/)[Google Maps](https://enrich.chat/companies-using/google-maps/) ## Which industry code is Quest Diagnostics filed under? Public profiles list Quest Diagnostics under [NAICS 621511](https://enrich.chat/naics/621511/), Medical Laboratories. Open the code to see the other companies filed under it, where they are based and how big they are. ## Frequently asked questions ### How many employees does Quest Diagnostics have? Quest Diagnostics is in the 50,000 to 100,000 employees range on its public company profile. Headcounts are rounded and change as companies hire, so treat the range as a guide. ### What industry is Quest Diagnostics in? Quest Diagnostics works in medical practice. This group covers physician groups, specialty practices and other clinics that provide outpatient medical care. ### What technology does Quest Diagnostics use? Tools detected on its public footprint include Microsoft 365, Cedexis Radar, NGINX and Amazon SES, across 15 categories. A detected tool shows it was seen, not what Quest Diagnostics pays for it. ### Where is Quest Diagnostics headquartered? Quest Diagnostics is headquartered in Secaucus, New Jersey. ### What is the website of Quest Diagnostics? Quest Diagnostics's website is questdiagnostics.com. Staff email usually uses a domain like it, so check the pattern with the free email format finder before you write to anyone. ## Try this prompt Find people at Quest Diagnostics ```text Use www.enrich.chat to find the practice administrators, physicians and clinic managers at questdiagnostics.com, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [SYNLAB International](https://enrich.chat/company/synlab-international/) - [Hamad Medical](https://enrich.chat/company/hamad-medical/) - [AGC Group](https://enrich.chat/company/agc-group/) - [Akkodis](https://enrich.chat/company/akkodis/) - [Al Jaber Group](https://enrich.chat/company/al-jaber-group/) - [Alshaya Group](https://enrich.chat/company/alshaya-group/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)